Cita APA (7th ed.)

Zim, H. S., & Gabrielson, I. N. (1956). Birds: A guide to the most familiar american birds. Simon and Schuster.

Cita Chicago (17th ed.)

Zim, Herbert S., i Ira N. Gabrielson. Birds: A Guide to the Most Familiar American Birds. Nueva York: Simon and Schuster, 1956.

Cita MLA (9th ed.)

Zim, Herbert S., i Ira N. Gabrielson. Birds: A Guide to the Most Familiar American Birds. Simon and Schuster, 1956.