APA (7th ed.) Citation

Pettingill, O. S. (1953). A guide to bird finding west of the Mississippi. Oxford University Press.

Chicago Style (17th ed.) Citation

Pettingill, Olin Sewall. A Guide to Bird Finding West of the Mississippi. New York: Oxford University Press, 1953.

MLA (9th ed.) Citation

Pettingill, Olin Sewall. A Guide to Bird Finding West of the Mississippi. Oxford University Press, 1953.