APA (7th ed.) Citation

Simpson, G. G. (1933). Structure and affinities of Trigonostylops. The American Museum of Natural History.

Chicago Style (17th ed.) Citation

Simpson, George Gaylord. Structure and Affinities of Trigonostylops. New York City: The American Museum of Natural History, 1933.

MLA (9th ed.) Citation

Simpson, George Gaylord. Structure and Affinities of Trigonostylops. The American Museum of Natural History, 1933.