Cita APA (7a ed.)

Dorcas, M. E., & Gibbons, J. W. (2011). Frogs: The Animal Answer Guide. Johns Hopkins University Press.

Cita Chicago Style (17a ed.)

Dorcas, Michael E., y J. Whitfield Gibbons. Frogs: The Animal Answer Guide. Baltimore: Johns Hopkins University Press, 2011.

Cita MLA (8a ed.)

Dorcas, Michael E., y J. Whitfield Gibbons. Frogs: The Animal Answer Guide. Johns Hopkins University Press, 2011.