1. Blair AP (1941) Variation, isolation mechanisms and hybridization in certain toads. Genetics 26:398?417
2. Blair WF (1959) Genetic compatibility and species groups in US toads. Texas J Sci 11: 427?458
3. Blair WF (1960) Further evidence bearing on intergroup genetic compatibility in toads. (GenusBufo). Texas J Sci 13:736?775
4. Blair WF (1972) Evidence from hybridization. In: Blair WF (ed) Evolution in the GenusBufo. Univ of Texas Press, Austin and London, pp 196?232
5. Brown LE, Littlejohn MJ (1972) Male release call in theBufo americanus group. In: Blair WF (ed) Evolution of the GenusBufo. Univ of Texas Press, Austin, pp 311?323