Cita APA (7a ed.)

Duellman, W. E. (1999). Patterns of distribution of amphibians: : a global perspective. : Johns Hopkins University Press.

Cita Chicago Style (17a ed.)

Duellman, William Edward. Patterns of Distribution of Amphibians: : A Global Perspective. Baltimore, MD: : Johns Hopkins University Press, 1999.

Cita MLA (8a ed.)

Duellman, William Edward. Patterns of Distribution of Amphibians: : A Global Perspective. : Johns Hopkins University Press, 1999.