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Speech-language pathology is a field of expertise practiced by a clinician known as a speech-language pathologist (SLP) or a speech therapist. SLP is considered a "related health profession" or "allied health profession" along with audiology, behavior analysis, optometry, occupational therapy, rehabilitation psychology, physical therapy, and others.
SLPs specialize in the evaluation, diagnosis, and treatment of communication disorders (speech disorders and language disorders), cognitive-communication disorders, voice disorders, and swallowing disorders. SLPs also play an important role in the diagnosis and treatment of autism spectrum disorder (often in a team with pediatricians and psychologists).
A common misconception is that speech-language pathology is restricted treatment of articulation disorders (e.g. helping English speaking individuals enunciate the traditionally difficult "r") and/or the treatment of individuals who stutter. In fact, speech-language pathology is concerned with a broad scope of speech, language, swallowing, and voice issues involved in communication, some of which include:
- Word-finding and other semantic issues, either as a result of a specific language impairment (SLI) such as a language delay or as a secondary characteristic of a more general issue such as dementia.
- Social communication difficulties involving how people communicate or interact with others (pragmatics).
- Language impairments, including difficulties creating sentences that are grammatical (syntax) and modifying word meaning (morphology).
- Literacy impairments (reading and writing) related to the letter-to-sound relationship (phonics), the word-to-meaning relationship (semantics), and understanding the ideas presented in a text (reading comprehension).
- Voice difficulties, such as a raspy voice, a voice that is too soft, or other voice difficulties that negatively impact a person's social or professional performance.
- Cognitive impairments (e.g., attention, memory, executive function) to the extent that they interfere with communication.
The components of speech production include:
- phonation (producing sound)
- Pitch variance;
- Voice (including aeromechanical components of respiration)
The components of language include:
- Phonology (manipulating sound according to the rules of a language);
- Morphology (understanding components of words and how they can modify meaning);
- Syntax (constructing sentences according to the grammatical rules of a target language);
- Semantics (interpreting signs or symbols of communication such as words or signs to construct meaning);
- Pragmatics (social aspects of communication).
Primary pediatric speech and language disorders include: receptive and expressive language disorders, speech sound disorders, childhood apraxia of speech (CAS), stuttering, and language-based learning disabilities. Speech pathologist not only work with adolescents with speech and language impediments, but also those that are elderly.
Swallowing disorders include difficulties in any system of the swallowing process (i.e. oral, pharyngeal, esophageal), as well as functional dysphagia and feeding disorders. Swallowing disorders can occur at any age and can stem from multiple causes.
- 1 The profession
- 2 Methods of assessment
- 3 Clients and patients
- 4 See also
- 5 References
- 6 Further reading
- 7 External links
Speech-language pathologists (SLPs) provide a wide range of services, mainly on an individual basis, but also as support for individuals, families, support groups, and providing information for the general public. SLPs work to prevent, assess, diagnose, and treat speech, language, social communication, cognitive-communication, and swallowing disorders in children and adults. Speech services begin with initial screening for communication and swallowing disorders and continue with assessment and diagnosis, consultation for the provision of advice regarding management, intervention, and treatment, and providing counseling and other follow up services for these disorders. Services are provided in the following areas:
- cognitive aspects of communication (e.g., attention, memory, problem-solving, executive functions).
- speech (phonation, articulation, fluency, resonance, and voice including aeromechanical components of respiration);
- language (phonology, morphology, syntax, semantics, and pragmatic/social aspects of communication) including comprehension and expression in oral, written, graphic, and manual modalities; language processing; preliteracy and language-based literacy skills, phonological awareness.
- augmentative and alternative communication, for individuals with severe language and communication impairments.
- swallowing or other upper aerodigestive functions such as infant feeding and aeromechanical events (evaluation of esophageal function is for the purpose of referral to medical professionals);
- voice (hoarseness (dysphonia), poor vocal volume (hypophonia), abnormal (e.g. rough, breathy, strained) vocal quality. Research demonstrates voice therapy to be especially helpful with certain patient populations; individuals with Parkinson's Disease often develop voice issues as a result of their disease.
- sensory awareness related to communication, swallowing, or other upper aerodigestive functions.
Speech, language, and swallowing disorders result from a variety of causes, such as a stroke, brain injury, hearing loss, developmental delay, a cleft palate, cerebral palsy, or emotional issues.
SLPs collaborate with other health care professionals, often working as part of a multidisciplinary team. They can provide information and referrals to audiologists, physicians, neonatal specialists , dentists, nurses, nurse practitioners, occupational therapists, rehabilitation psychologists, dietitians, educators, behavior consultants (applied behavior analysis), hospital chaplains/spiritual carers   and parents as dictated by the individual client's needs. For example, the treatment for patients with cleft lip and palate, often requires multidisciplinary collaboration. Speech-language pathologists can be very beneficial to help resolve speech problems associated with cleft lip and palate. Research has indicated that children who receive early language intervention are less likely to develop compensatory error patterns later in life, although speech therapy outcomes are usually better when surgical treatment is performed earlier. Another area of collaboration relates to auditory processing disorders, where SLPs can collaborate in assessments and provide intervention where there is evidence of speech, language, and/or other cognitive-communication disorders. Palliative care is another health care area that often involves multi-disciplinary collaboration involving speech-language pathologists. La Trobe University Palliative Care Unit (PCU)  (Melbourne, Australia) has been a strong advocate for speech-language pathologists being included within both paediatric  and adult palliative care  multidisciplinary teams. Currently the PCU is conducting an international modified delphi study to provide 'Recommendations for Speech-Language Pathologist in Paediatric Palliative Care Teams' (abbrev. RESP3CT). The international role of SLPs is also being considered with regard to SLPs being "Global Citizens" through nine capabilities, (i) global acquaintance, (iii) global awareness, (iv) global openness and participation, (v) valuing diversity, (vi) social justice, (vii) felt responsibility, (viii) environmental sustainability and (ix) participating in inter-group helping. Research exploring the multi-discipline collaboration involving SLPs and other allied health professions with regard to global citizenship is currently being conducted . .
SLPs work in a variety of clinical and educational settings. SLPs work in public and private hospitals, skilled nursing facilities (SNFs), long-term acute care (LTAC) facilities, hospice, and home healthcare. SLPs may also work as part of the support structure in the education system, working in both public and private schools, colleges, and universities. Some SLPs also work in community health, providing services at prisons and young offenders' institutions or providing expert testimony in applicable court cases.
Following the American Speech-Language-Hearing Association's (ASHA's) 2005 approval of the delivery of speech/language services via video conference or telepractice, SLPs in the United States have begun to use this service model.
SLPs conduct research related to communication sciences and disorders, swallowing disorders, or other upper aerodigestive functions.
Education and trainingEdit
In the United States, speech-language pathology is a Master's entry-level professional degree field. Clinicians must hold a master's degree in Communicative Disorders/Speech-Language Pathology (e.g. M.A., M.S., or M.Ed.) that is from a university that holds regional accreditation and from a communication sciences and disorders program that is accredited by the American Speech-Language-Hearing Association (ASHA), the profession's national governing body as well as individual state's governing board. Programs that offer the M.Ed. degree are often housed within a university's College of education, but offer the same education and training as programs with a M.A. or M.S. degree. Beyond the master's degree, some SLPs may choose to earn a clinical doctorate in Speech-Language Pathology (e.g. CScD or SLPD), or a doctoral degree that has a research and/or professional focus (e.g., Ph.D., or Ed.D.). All degrees must be from a university that holds regional accreditation, but only the master's degree is accredited by the American Speech-Language-Hearing Association (ASHA).
All clinicians are required to complete 400 clinical hours (25 observation hours often completed during the undergraduate degree and 375 hours of graduate Clinical Practicum). They must pass multiple comprehensive exams also called Knowledge and Skills Acquisition (KASA) exams.
After all the above requirements have been met during the SLP's path to earning the graduate degree, SLPs must state licensure and national certification by:
- Passing the National Speech-Language Pathology board exam (Praxis).
- Successfully complete a clinical fellowship year (CFY) as a clinical fellow (CF) under the mentorship of a fully licensed mentor clinician. The CFY is no less than 36 weeks of full-time experience, totaling a minimum of 1260 hours. During the CFY, the CF cannot earn CFY hours unless they work more than 5 hours in a week and cannot earn any CFY hours beyond 35 hours in a week.
- Receive American Speech-Language-Hearing Association (ASHA) Certificate of Clinical Competence (CCC) and full state licensure to practice, following successful completion of clinical fellowship year(CFY).
- States are responsible for licensure of clinicians and other professionals and, as far as the new SLP, these requirements are often similar to that of the CFY. Following the state licensure procedures and national certification requirements are usually done simultaneously.
Maintaining licensure through continuing education:
- To maintain licensure, SLPs are required to participate in periodic earning of Continuing Educational Units (CEU).
Continuing education and training obligations:
- Educate, supervise, and mentor future SLPs.
- Participate in continuing education.
- Educate and provide in-service training to families, caregivers, and other professionals.
- Train, supervise, and manage speech-language pathology assistants (SLPA) and other support personnel.
- Educating and counseling individuals, families, co-workers, educators, and other persons in the community regarding acceptance, adaptation, and decisions about communication and swallowing.
- Credentials of a clinical fellow typically read as: MA, MS, or M.Ed, CF-SLP (e.g., Jane Doe, MA, CF-SLP).
- Credentials of a fully licensed SLP commonly read as: MA, MS, or M.Ed, CCC-SLP (e.g., Jane Doe, MA, CCC-SLP), indicating a practitioner's graduate degree and successful completion of the fellowship year/board exams to obtain the "three Cs" the Certification of Clinical Competence, in speech-language pathology.
Salaries of SLPs depend on a variety of factors including educational background, work experience, and location. The ASHA 2016 Schools Survey revealed that SLPs received a median academic year salary of 62,000, which is a 2% increase from the latest Schools Survey done in 2014. Additionally, ASHA released results for the 2015 SLP Health Care Survey which placed the median salary for SLPs working within the health care industry at $75,000. However, salaries can range from $47,000–116,000. In Australia, the basic salary that a Graduate SLP would earn is estimated at $59,500 Australian dollars rising to $120,000 for Private SLP.
Methods of assessmentEdit
For many parents, the decision of whether or not to enroll students into school-based speech therapy or privately practiced therapy is challenging. Speech Pathologists work as part of a team alongside teachers, counselors, social workers and parents when in a school setting. Because school-based speech therapy is run under state guidelines and funds, the process of assessment and qualification is more strict. To qualify for in-school speech therapy, students must meet the state's criteria on language testing and speech standardization. Due to such requirements, some students may not be assessed in an efficient time frame or their needs may be undermined by criteria. For a private clinic, students are more likely to qualify for therapy because it is a paid service with more availability.
Clients and patientsEdit
Speech-language pathologists work with clients and patients who may present with a wide range of issues.
Infants and childrenEdit
- Infants with injuries due to complications at birth, feeding and swallowing difficulties, including dysphagia
- Children with mild, moderate or severe:
- Genetic disorders that adversely affect speech, language and/or cognitive development including cleft palate, Down syndrome, DiGeorge syndrome
- Attention deficit hyperactivity disorder
- Autism spectrum disorders, including Asperger syndrome
- Developmental delay
- Feeding disorders, including oral motor deficits
- Cranial nerve damage
- Hearing loss
- Craniofacial anomalies that adversely affect speech, language and/or cognitive development
- Language delay
- Specific language impairment
- Specific difficulties in producing sounds, called articulation disorders, (including vocalic /r/ and lisps)
- Pediatric traumatic brain injury
- Developmental verbal dyspraxia
- Cleft palate
In the US, some children are eligible to receive speech therapy services, including assessment and lessons through the public school system. If not, private therapy is readily available through personal lessons with a qualified Speech-Language Pathologist or the growing field of telepractice. Teleconferencing tools such as Skype are being used more commonly as a means to access remote locations in private therapy practice, such as in the geographically diverse south island of New Zealand. More at-home or combination treatments have become readily available to address specific types of articulation disorders. The use of mobile applications in speech therapy is also growing as an avenue to bring treatment into the home.
In the UK, children are entitled to an assessment by local NHS Speech and Language Therapy teams, usually after referral by health visitors or education settings, but parents are also entitled to request an assessment directly. If treatment is appropriate, an educational plan will be drawn up. Speech therapists often play a role in multi-disciplinary teams where a child has speech delay or disorder as part of a wider health condition. The Children's Commissioner for England reported in June 2019 that there was a postcode lottery. £291.65 a year per head was spent on services in some areas, while the budget in some areas was £30.94 or less. In 2018, 193,971 children in English primary schools were on the special educational needs register needing speech therapy services.
Children and adultsEdit
- Adults with mild, moderate, or severe eating, feeding and swallowing difficulties, including dysphagia
- Adults with mild, moderate, or severe language difficulties as a result of:
- Adults seeking transgender-specific voice training, including voice feminization and voice masculinization
- All India Institute of Speech and Hearing
- AIIMS, New Delhi
- American Speech-Language-Hearing Association
- Applied linguistics
- Auditory processing disorder
- Augmentative and alternative communication
- Esophageal speech
- Frenkel exercises
- Language delay
- List of university speech-language pathology departments
- List of voice disorders
- Motor theory of speech perception
- Mobile app tools (Outloud Apps)
- Oral myology
- Origin of speech
- Specific language impairment
- Speech acquisition
- Speech and language impairments
- Speech and language pathology in school settings
- Speech perception
- Speech processing
- Speech repetition
- Brady, Marian C.; Kelly, Helen; Godwin, Jon; Enderby, Pam; Campbell, Pauline (2016-06-01). "Speech and language therapy for aphasia following stroke". The Cochrane Database of Systematic Reviews (6): CD000425. doi:10.1002/14651858.CD000425.pub4. hdl:1893/26112. ISSN 1469-493X. PMID 27245310.
- American Speech-Language-Hearing Association (2016). "Scope of practice in speech-language pathology [Service Delivery Areas]". www.asha.org/policy. doi:10.1044/policy.SP2016-00343. Retrieved September 10, 2016.
- Block, Frances K.; Amie Amiot; Cheryl Deconde Johnson; Gina E. Nimmo; Peggy G. Von Almen; Deborah W. White; Sara Hodge Zeno (1993), "Definitions of Communication Disorders and Variations", Ad Hoc Committee on Service Delivery in the Schools, ASHA, doi:10.1044/policy.RP1993-00208, retrieved 2010-08-07
- Weeks, Katie (July 12, 2016). "Speech and Language Disorders". Speech SF.
- "Who Are Speech-Language Pathologists, and What Do They Do?". www.asha.org. Retrieved 2018-05-03.
- "Scope of Practice in Speech-Language Pathology". 2016. doi:10.1044/policy.SP2016-00343. Retrieved September 21, 2016. Cite journal requires
- "Speech-Language Pathologists". American Speech-Language-Hearing Association. Retrieved 6 April 2015.
- Factor, Stewart; Weiner, William (2008). Parkinson's disease: Diagnosis & clinical management : Second edition (2nd, rev. and updat;2; ed.). ed.). U.S.: Demos Medical Publishing. pp. 77–83. ISBN 9781933864006.
- Richards, Emma (June 2012). "Communication and swallowing problems after stroke". Nursing and Residential Care. 14 (6): 282–286. doi:10.12968/nrec.2012.14.6.282.
- Editors, Nathan D. Zasler, Douglas I. Katz, Ross D. Zafonte, Associate Editors, David B. Arciniegas, M. Ross Bullock, Jeffrey S. Kreutzer (2013). Brain injury medicine principles and practice (2nd ed.). New York: Demos Medical. pp. 1086–1104, 1111–1117. ISBN 9781617050572.CS1 maint: multiple names: authors list (link) CS1 maint: extra text: authors list (link)
- Ching, Teresa Y. C. (2015). "Is early intervention effective in improving spoken language outcomes of children with congenital hearing loss?". American Journal of Audiology (Online). 24 (3): 345–348. doi:10.1044/2015_aja-15-0007. PMC 4659415. PMID 26649545.
- The Royal Children's Hospital, Melbourne. "Developmental Delay: An Information Guide for Parents" (PDF). The Royal Children's Hospital Melbourne. The Royal Children's Hospital Melbourne. Retrieved 2 May 2016.
- Bauman-Waengler, Jacqueline (2011). Articulatory and phonological impairments : a clinical focus (4th ed., International ed.). Harlow: Pearson Education. pp. 378–385. ISBN 9780132719957.
- "Speech and Language Therapy". My Child at cerebralpalsy.org. Retrieved 2 May 2016.
- Cross, Melanie (2011). Children with social, emotional and behavioural difficulties and communication problems: there is always a reason (2nd ed.). London: Jessica Kingsley Publishers.
- Mathisen, Bernice A.; Carey, Lindsay B.; O'Brien, Annette (2012). "Mathisen, B. A., Carey, L. B., & O'brien, A. (2012). Incorporating speech‐language pathology within Australian neonatal intensive care units. Journal of Paediatrics and Child Health, 48(9), 823-827". Journal of Paediatrics and Child Health. 48 (9): 823–827. doi:10.1111/j.1440-1754.2012.02549.x. PMID 22970676.
- Mathisen, Bernice; Carey, Lindsay B.; Carey-Sargeant, Christa L.; Webb, Gwendalyn; Millar, Carajane; Krikheli, Lilli (2015). "Mathisen, B., Carey, L. B., Carey-Sargeant, C. L., Webb, G., Millar, C., & Krikheli, L. (2015). Religion, spirituality and speech-language pathology: A viewpoint for ensuring patient-centred holistic care. Journal of Religion and Health, 54(6), 2309-2323". Journal of Religion and Health. 54 (6): 2309–2323. doi:10.1007/s10943-015-0001-1. PMID 25586135.
- Carey, Lindsay B.; Mathisen, Bernice A. (2018-06-21). Mathisen, B. A., & Threats, T. (2018). Speech-Language Pathology and Spiritual Care. In: Lindsay B. Carey & Bernice A. Mathisen (Eds). Spiritual Care for Allied Health Practice: A Person-centered Approach (pp. 22-54). London: Jessica Kingsley Publishers. ISBN 9781785922206.
- Mihaela Frățilă; Emil Urtilă; Maria Ștefănescu (Oct 2011). "Speech therapy — criteria for determining the time of the surgical operation in surgery of labio-palato-velars cleft". Rev. Chir. Oro-maxilo-fac. Implantol. (in Romanian). 2 (2): 21–23. ISSN 2069-3850. 33. Retrieved 2012-06-06.(webpage has a translation button)
- DeBonis DA, Moncrieff D (February 2008). "Auditory processing disorders: an update for speech-language pathologists". Am J Speech Lang Pathol. 17 (1): 4–18. doi:10.1044/1058-0360(2008/002). PMID 18230810.
- "La Trobe University Palliative Care Unit (Bundoora Campus, Melbourne, Australia)". La Trobe University Palliative Care Unit. Retrieved 20 October 2018.
- Krikheli, Lillian; Mathisen, Bernice A.; Carey, Lindsay B. (2018). "Krikheli, L., Mathisen, B. A., & Carey, L. B. (2017). Speech–language pathology in paediatric palliative care: A scoping review of role and practice. International Journal of Speech-Language Pathology, [Online, pp. 1-13]". International Journal of Speech-Language Pathology. 20 (5): 541–553. doi:10.1080/17549507.2017.1337225. PMID 28665209.
- Chahda, Laura; Mathisen, Bernice A.; Carey, Lindsay B. (2017). "Chahda, L., Mathisen, B. A., & Carey, L. B. (2017). The role of speech-language pathologists in adult palliative care. International journal of speech-language pathology, 19(1), 58-68". International Journal of Speech-Language Pathology. 19 (1): 58–68. doi:10.1080/17549507.2016.1241301. PMID 27762632.
- Krikheli, Lillian; Carey, Lindsay B.; Mathisen, Bernice A.; Erickson, Shane; Carey-Sargeant, Christa L. (2018). "Krikheli, L., Carey, L.B., Mathisen, B., Erickson, S., & Carey-Sargeant, C.L. (November 2018). Speech-language pathologists in paediatric palliative care: a Delphi study protocol. BMJ Supportive and Palliative Care [Online First]". BMJ Supportive and Palliative Care. [Online]: bmjspcare–2018–001667. doi:10.1136/bmjspcare-2018-001667. PMID 30446492.
- Millar, C J; Carey, L B; Fortune, T(2019) (2019). "Global Citizenship: Defining capabilities for speech-language pathology". International Journal of Speech-Language Pathology. Online (3): 317–324. doi:10.1080/17549507.2019.1607902. PMID 31084263.
- Pollens R (October 2004). "Role of the speech-language pathologist in palliative hospice care". J Palliat Med. 7 (5): 694–702. doi:10.1089/jpm.2004.7.694. PMID 15588361.
- "Speech and language therapist - NHS Careers".
- "Speech and language therapy". Royal College of Speech and Language Therapists.
- "ASHA Telepractice Position Statement". Asha.org. Retrieved 2010-04-15.
- "Standards for Accreditation of Graduate Education Programs in Audiology and Speech-Language Pathology" (PDF). CAA. January 1, 2008. Retrieved August 16, 2016.
- "Speech-Language Pathology Clinical Fellowship". www.asha.org.
- "Professional Profile of the Speech and Language Therapist".
- "Roles and Responsibilities of Speech-Language Pathologists in Schools".
- "Schools Survey Report: SLP Annual Salary and Hourly Wage Trends 2004–2016" (PDF). American Speech-Language-Hearing Association.
- "SLP Health Care Survey 2015" (PDF).
- "Speech-Language Pathologist Salary". www.usnews.com. U.S. News. Retrieved 8 March 2018.
Speech-language pathologists have seen a spike in pay the past few years. The median salary for pathologists jumped from $66,920 in 2010 to $74,680 in 2016, according to the BLS. The best-paid speech-language pathologists earned more than $116,810 in 2016, while the lowest-paid earned less than $47,070.
- "Speech Pathologist Salary (Australia)". www.payscale.com. Retrieved 2016-05-17.
- "Speech-Language Pathologist | explorehealthcareers.org". explorehealthcareers.org. Retrieved 2018-05-03.
- Bellani, M.; Moretti, A.; Perlini, C.; Brambilla, P. (Dec 2011). "Language disturbances in ADHD". Epidemiol Psychiatr Sci. 20 (4): 311–5. doi:10.1017/S2045796011000527. PMID 22201208.
- "International Statistical Classification of Diseases and Related Health Problems 10th Revision (ICD-10) Version for 2010". World Health Organisation. 2010.
- [dead link]
- Ogata, Y (2015). "The Speech Therapy of Cleft Palate Patients as an Oral Rehabilitation". Journal of Dentistry Indonesia. doi:10.14693/jdi.v4i3.758 (inactive 2019-12-04). Retrieved 15 May 2016.
- "Telepractice for SLPs and Audiologists". American Speech-Language-Hearing Association. Retrieved 19 December 2018.
- "Speech Therapy Wellington - Vocalsaints LTD". Vocalsaints. Retrieved 19 December 2018.
- "Help your baby learn to talk". nhs.uk. 21 December 2017. Retrieved 19 December 2018.
- "Postcode lottery for speech therapy, says commissioner". BBC. 11 June 2019. Retrieved 20 July 2019.
- Ritter, Michaela J. (June 2009). "The Speech-Language Pathologist and Reading: Opportunities to Extend Services for the Children We Serve". Perspectives on School-Based Issues. 10 (2): 38–44. doi:10.1044/sbi10.2.38. Retrieved 2012-04-15.
- "The Role of the Speech-Language Pathologist | DyslexiaHelp at the University of Michigan".
- Richard GJ (July 2011). "The role of the speech-language pathologist in identifying and treating children with auditory processing disorder". Lang Speech Hear Serv SCH. 42 (3): 241–5. doi:10.1044/0161-1461(2011/09-0090). PMID 21757563.
- "Speech Therapy Wellington | Vocalsaints LTD". Vocalsaints.
- Bryan, Karen (2002). "Speech and Language Therapy in Dementia". International Journal of Languages and Communication. 37 (2): 215–222. doi:10.1080/13682820110119205.
- Schulz, Geralyn (2000). "Effects of Speech Therapy and Pharmacologic and Surgical Treatments on Voice and Speech in Parkinson's Disease: a Review of the Literature". Journal of Communication Disorders. 33 (1): 59–88. doi:10.1016/S0021-9924(99)00025-8. PMID 10665513.
- Wilkinson, R (2014). "Intervening with Conversation Analysis in Speech and Language Therapy: Improving Aphasic Conversation". Research on Language and Social Interaction. 47 (3): 219–238. doi:10.1080/08351813.2014.925659.
- Richard K. Adler, Sandy Hirsch, Michelle Mordaunt (2012). Voice and Communication Therapy for the Transgender/Transsexual Client: A Comprehensive Clinical Guide. San Diego: Plural Publishing. ISBN 9781597564700.CS1 maint: multiple names: authors list (link)
- Fisher SE, Scharff C (April 2009). "FOXP2 as a molecular window into speech and language". Trends Genet. 25 (4): 166–77. doi:10.1016/j.tig.2009.03.002. PMID 19304338.
- "Discussion Meeting Issue 'Language in developmental and acquired disorders: converging evidence for models of language representation in the brain' - Table of Contents". Royal Society Publishing. 2014. Retrieved 31 December 2013.
- Nelson HD, Nygren P, Walker M, Panoscha R (February 2006). "Screening for speech and language delay in preschool children: systematic evidence review for the US Preventive Services Task Force". Pediatrics. 117 (2): e298–319. doi:10.1542/peds.2005-1467. PMID 16452337.
- Howell, Peter (2011). Recovery from stuttering. New York: Psychology Press/Taylor Francis Group. ISBN 978-1-84872-916-2. OCLC 814245820.