APA (7th ed.) Citation

Perrins, C. M., & Middleton, A. L. A. (1985). Encyclopedia of birds. Facts on File.

Chicago Style (17th ed.) Citation

Perrins, Christopher M., and Alex. L. A. Middleton. Encyclopedia of Birds. New York, N.Y.: Facts on File, 1985.

MLA (9th ed.) Citation

Perrins, Christopher M., and Alex. L. A. Middleton. Encyclopedia of Birds. Facts on File, 1985.