APA (7th ed.) Citation

Pettingill, O. S. (1980). A guide to bird finding east of the Mississippi (2nd ed.). Houghton Mifflin.

Chicago Style (17th ed.) Citation

Pettingill, Olin Sewall. A Guide to Bird Finding East of the Mississippi. 2nd ed. Boston: Houghton Mifflin, 1980.

MLA (9th ed.) Citation

Pettingill, Olin Sewall. A Guide to Bird Finding East of the Mississippi. 2nd ed. Houghton Mifflin, 1980.