APA (7th ed.) Citation

Powell, R., Collins, J. T., & Hooper, E. D. (1998). A key to amphibians and reptiles of the continental United States and Canada. University Press of Kansas.

Chicago Style (17th ed.) Citation

Powell, Robert, Joseph T. Collins, and Errol D. Hooper. A Key to Amphibians and Reptiles of the Continental United States and Canada. Lawrence: University Press of Kansas, 1998.

MLA (9th ed.) Citation

Powell, Robert, et al. A Key to Amphibians and Reptiles of the Continental United States and Canada. University Press of Kansas, 1998.