Mastodons and mammoths of North America
MLA
Osborn, Henry Fairfield. Mastodons and Mammoths of North America. American Museum of Natural History. Guide Leaflet. [New York, 1926
APA, 7th edition
Osborn, H. Fairfield. (1926). Mastodons and mammoths of North America. American Museum of Natural History. Guide leaflet. [New York
Chicago, 17th edition
Osborn, Henry Fairfield. Mastodons and mammoths of North America. American Museum of Natural History. Guide leaflet. [New York, 1926