APA (7th ed.) Citation

Bonner, M. G. (1944). Couriers of the sky; the story of pigeons. A. A. Knopf.

Chicago Style (17th ed.) Citation

Bonner, Mary Graham. Couriers of the Sky; the Story of Pigeons. New York: A. A. Knopf, 1944.

MLA (9th ed.) Citation

Bonner, Mary Graham. Couriers of the Sky; the Story of Pigeons. A. A. Knopf, 1944.