APA (7th ed.) Citation

Wallace, G. J., & Mahan, H. D. (1975). An introduction to ornithology (3rd ed.). Macmillan.

Chicago Style (17th ed.) Citation

Wallace, George John, and Harold D. Mahan. An Introduction to Ornithology. 3rd ed. New York: Macmillan, 1975.

MLA (9th ed.) Citation

Wallace, George John, and Harold D. Mahan. An Introduction to Ornithology. 3rd ed. Macmillan, 1975.