Cita APA

Bologna, G., & Bull, J. (1990). Guide to birds of the world. New York: Simon and Schiuster's.

Citación estilo Chicago

Bologna, Gianfranco, y John Bull. Guide to Birds of the World. New York: Simon and Schiuster's, 1990.

Cita MLA

Bologna, Gianfranco, y John Bull. Guide to Birds of the World. New York: Simon and Schiuster's, 1990.