APA (7th ed.) Citation

Beebe, W. (1924). Galapagos, world's end. Putnam's.

Chicago Style (17th ed.) Citation

Beebe, William. Galapagos, World's End. New York, London: Putnam's, 1924.

MLA (9th ed.) Citation

Beebe, William. Galapagos, World's End. Putnam's, 1924.