APA

National Museum of Natural History (U.S.), Fisher R. D. & Ludwig C. A. (2012). Catalog of type specimens of recent Mammals: Rodentia (Sciuromorpha and Castorimorpha) in the National Museum of Natural History, Smithsonian institution. Washington D. C: Smithsonian Institution Scholarly Press.

Chicago

National Museum of Natural History (U.S.), Fisher Robert D and Ludwig Craig A. 2012. Catalog of type specimens of recent Mammals: Rodentia (Sciuromorpha and Castorimorpha) in the National Museum of Natural History, Smithsonian institution. Washington D. C: Smithsonian Institution Scholarly Press.

Harvard

National Museum of Natural History (U.S.), Fisher R. D. and Ludwig C. A. (2012). Catalog of type specimens of recent Mammals: Rodentia (Sciuromorpha and Castorimorpha) in the National Museum of Natural History, Smithsonian institution. Washington D. C: Smithsonian Institution Scholarly Press.

MLA

National Museum of Natural History (U.S.), Fisher Robert D and Ludwig Craig A. Catalog of type specimens of recent Mammals: Rodentia (Sciuromorpha and Castorimorpha) in the National Museum of Natural History, Smithsonian institution. Washington D. C: Smithsonian Institution Scholarly Press. 2012.