Cita APA (7a ed.)
Simpson, G. G. (1948). The beginning of the age of mammals in South America. American Museum of Natural History.
Cita Chicago Style (17a ed.)
Simpson, George Gaylord. The Beginning of the Age of Mammals in South America. New York: American Museum of Natural History, 1948.
Cita MLA (9a ed.)
Simpson, George Gaylord. The Beginning of the Age of Mammals in South America. American Museum of Natural History, 1948.
Precaución: Estas citas no son 100% exactas.