1. Wiedersheim, R. Die Anatomie der Gymnophiona, 44–57 (Fisher, Jena, 1879).
2. Billo, R. & Wake, M. H. J. Morph. 192, 101–111 (1987).
3. Badenhorst, A. Ann. Univ. Stellenbosch (A2) 1, 1–26 (1978).
4. Himstedt, W. & Simon, D. Herpet. J. 5, 266–270 (1995).
5. Wake, M. H. Zoomorphology 105, 277–295 (1985).