APA (7th ed.) Citation

Zim, H. S., & Gabrielson, I. N. (1949). Birds: A guide to the most familiar American birds. Simon and Schuster.

Chicago Style (17th ed.) Citation

Zim, Herbert S., and Ira Noel Gabrielson. Birds: A Guide to the Most Familiar American Birds. New York: Simon and Schuster, 1949.

MLA (9th ed.) Citation

Zim, Herbert S., and Ira Noel Gabrielson. Birds: A Guide to the Most Familiar American Birds. Simon and Schuster, 1949.