APA (7th ed.) Citation

Sibley, D. A. (2014). The Sibley guide to birds (Second edition.). Alfrred A. Knopf.

Chicago Style (17th ed.) Citation

Sibley, David Allen. The Sibley Guide to Birds. Second edition. New York: Alfrred A. Knopf, 2014.

MLA (9th ed.) Citation

Sibley, David Allen. The Sibley Guide to Birds. Second edition. Alfrred A. Knopf, 2014.