Cita APA (7th ed.)

Wallace, G. J. (1955). An introduction to Ornithology. Macmillan.

Cita Chicago (17th ed.)

Wallace, George J. An Introduction to Ornithology. New York, USA: Macmillan, 1955.

Cita MLA (9th ed.)

Wallace, George J. An Introduction to Ornithology. Macmillan, 1955.