1. Alberch, P., and Alberch, J. 1981. Heterochronic mechanisms of morphological diversification and evolutionary change in the neotropical salamander Bolitoglossa occidentals (Amphibia: Plethodontidate). J. Morph. 167:249–264.
2. Allin, E.F. 1986. The auditory apparatus of advanced mammal-like reptiles and early mammals. In Ecology and biology of mammal-like reptiles (Hotton N.H. III, MacLean, P.D., Roth, J.J., and Roth, E.C., eds.). Washington, D.C.: Smithsonian Institution and National Institute of Mental Health, pp. 283–294.
3. Anderson, H.M., and Cruickshank, A.R.I. 1978. The biostratigraphy of the Permian and Triassic. Part 5: A review of the classification and distribution of Permo-Triassic tetrapods. Palaeontl. Afr. 21:15–44.
4. Aulie, R.P. 1974. The origin of the idea of mammal-like reptile. Parts I-III. Am. Biol. Teacher 36:476–485; 36:545–553; 37:21–32.
5. Barbarena, M.C. 1974. Contribuicao ao conhecimento dos cinodontes gonfodontes (Cynodontia, Tritylodontidae) do Brasil. Ph.D. thesis, University Federal do Rio Grande del Sul.