APA (7th ed.) Citation

Pettingill, O. S. (1977). A guide to bird finding east of the Mississippi (2d ed.). Oxford University Press.

Chicago Style (17th ed.) Citation

Pettingill, Olin Sewall. A Guide to Bird Finding East of the Mississippi. 2d ed. New York: Oxford University Press, 1977.

MLA (9th ed.) Citation

Pettingill, Olin Sewall. A Guide to Bird Finding East of the Mississippi. 2d ed. Oxford University Press, 1977.