APA (7th ed.) Citation

Allen, E. G. (1951). The history of American ornithology before Audubon. American Philosophical Society.

Chicago Style (17th ed.) Citation

Allen, Elsa Guerdrum. The History of American Ornithology Before Audubon. Philadelphia: American Philosophical Society, 1951.

MLA (9th ed.) Citation

Allen, Elsa Guerdrum. The History of American Ornithology Before Audubon. American Philosophical Society, 1951.