Cita APA

Ridgely, R. S., & Gwynne, J. A. (1981). A guide to the bird of Panama. New Jersey: Princeton University.

Citación estilo Chicago

Ridgely, Robert S., y John A. Gwynne. A Guide to the Bird of Panama. New Jersey: Princeton University, 1981.

Cita MLA

Ridgely, Robert S., y John A. Gwynne. A Guide to the Bird of Panama. New Jersey: Princeton University, 1981.