Aemilius Asper wrote commentaries on Terence, Sallust and Virgil dealing with content and form, and including parallels with other authors. Numerous fragments of the commentary on Virgil show that as both critic and commentator he possessed good judgment and taste. They are printed in Keil, Probi in Vergilii Bucolica Commentarius (1848); see also Suringar, Historia Critica Scholiastarum Latinum (1834); Grafenhan, Geschichte der klassischen Philologie im Alterthum, iv (1843–1850).
Two short grammatical treatises, extant under the name of Asper, and of very little value, have nothing to do with the commentator, but belong to a much later date; the time of Priscian (6th century). Both are printed in Keil, Grammatici Latini.
- Thomsin, Alfred (1952). Étude sur le commentaire virgilien d'Aemilius Asper. Bibliothèque de la Faculté de philosophie et lettres de l'Université de Liège.
- This article incorporates text from a publication now in the public domain: Chisholm, Hugh, ed. (1911). "Asper, Aemilius". Encyclopædia Britannica. 2 (11th ed.). Cambridge University Press. p. 767. That refers to Schanz, Geschichte der romischen Litteratur, sect. 598.