APA (7th ed.) Citation

Stiles, F. G., Skutch, A. F., & Gardner, D. (1989). A guide to the birds of Costa Rica. Comstock Publishing Associates.

Chicago Style (17th ed.) Citation

Stiles, F. Gary, Alexander F. Skutch, and Dana Gardner. A Guide to the Birds of Costa Rica. Ithaca, New York: Comstock Publishing Associates, 1989.

MLA (9th ed.) Citation

Stiles, F. Gary, et al. A Guide to the Birds of Costa Rica. Comstock Publishing Associates, 1989.