Bibliography
Sage, R. D., E. M. Prager, and D. B. Wake . 1982. A Cretaceous divergence time between pelobatid frogs (Pelobates and Scaphiopus): immunological studies of serum albumin. Journal of Zoology. London 198: 481-494.
Sage, R. D., E. M. Prager, and D. B. Wake . 1982. A Cretaceous divergence time between pelobatid frogs (Pelobates and Scaphiopus): immunological studies of serum albumin. Journal of Zoology. London 198: 481-494.
