APA (7th ed.) Citation

Sibley, D. (2009). The Sibley guide to trees. Alfred A. Knopf.

Chicago Style (17th ed.) Citation

Sibley, David. The Sibley Guide to Trees. New York: Alfred A. Knopf, 2009.

MLA (8th ed.) Citation

Sibley, David. The Sibley Guide to Trees. Alfred A. Knopf, 2009.

Warning: These citations may not always be 100% accurate.