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  • Houston, Rob (editor); Lea, Maxine (art editor) (2007). The Human Body Book. Dorling Kindersley. ISBN 978-1-8561-3007-3. {{cite book}}: |author1= has generic name (help)
  • Forshaw, Joseph M. (2006). Parrots of the World; an Identification Guide. Illustrated by Frank Knight. Princeton University Press. ISBN 0-691-09251-6. {{cite book}}: Unknown parameter |nopp= ignored (|no-pp= suggested) (help)
  • Gray, Henry (1942). Johnston, T.B; Whillis, J (eds.). Gray's Anatomy: Descriptive and Applied (28th ed.). Longmans, Green and Co.
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  • Long, Richard G; Scott, Brian B, eds. (2005). Specialist Training in Gastroenterology and Liver Disease. Elsevier Mosby. ISBN 0-7234-3252-X.
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