APA (7th ed.) Citation

Clements, J. F. (1981). Birds of the world, a checklist. Facts on File.

Chicago Style (17th ed.) Citation

Clements, James F. Birds of the World, a Checklist. New York, N.Y.: Facts on File, 1981.

MLA (9th ed.) Citation

Clements, James F. Birds of the World, a Checklist. Facts on File, 1981.