Cita APA (7a ed.)

Gill, F. B. (1995). Ornithology (2d. ed.). W.H. Freeman.

Cita Chicago Style (17a ed.)

Gill, Frank B. Ornithology. 2d. ed. New York: W.H. Freeman, 1995.

Cita MLA (8a ed.)

Gill, Frank B. Ornithology. 2d. ed. W.H. Freeman, 1995.