APA (7th ed.) Citation

Pettingill, O. S. (1974). The bird watcher's America (Apollo ed.). Crowell.

Chicago Style (17th ed.) Citation

Pettingill, Olin Sewall. The Bird Watcher's America. Apollo ed. New York: Crowell, 1974.

MLA (9th ed.) Citation

Pettingill, Olin Sewall. The Bird Watcher's America. Apollo ed. Crowell, 1974.