Cita APA (7th ed.)

Mattison, C. (1987). Frogs and Toads of the World. Princeton University.

Cita Chicago (17th ed.)

Mattison, Chris. Frogs and Toads of the World. New Jersey: Princeton University, 1987.

Cita MLA (9th ed.)

Mattison, Chris. Frogs and Toads of the World. Princeton University, 1987.