APA (7th ed.) Citation

Simpson, G. G. (1948). The beginning of the age of mammals in South America. American Mus. of Natural Hist.

Chicago Style (17th ed.) Citation

Simpson, George Gaylord. The Beginning of the Age of Mammals in South America. New York: American Mus. of Natural Hist, 1948.

MLA (9th ed.) Citation

Simpson, George Gaylord. The Beginning of the Age of Mammals in South America. American Mus. of Natural Hist, 1948.