APA (7th ed.) Citation

Buckley, P. A., & Buckley, F. G. (2002). Royal tern: Sterna maxima. Birds of North America, Inc..

Chicago Style (17th ed.) Citation

Buckley, P. A., and Francine G. Buckley. Royal Tern: Sterna Maxima. Philadelphia, Pa.: Birds of North America, Inc., 2002.

MLA (9th ed.) Citation

Buckley, P. A., and Francine G. Buckley. Royal Tern: Sterna Maxima. Birds of North America, Inc., 2002.