Branch, W. R. (1976). “Two exceptional food records for the African bullfrog, Pyxicephalus adspersus (Amphibia, Anura, Pyxicephalidae)”. Journal of Herpetology. 10 (3): 266–268. doi:10.2307/1562997. JSTOR1562997.
Branch, W. R. (1976). “Two exceptional food records for the African bullfrog, Pyxicephalus adspersus (Amphibia, Anura, Pyxicephalidae)”. Journal of Herpetology. 10 (3): 266–268. doi:10.2307/1562997. JSTOR1562997.