Minnesota State University. "George Schaller". Minnesota State University, Mankato. Archived from the original on September 24, 2007. Retrieved October 5, 2007.
nationalbook.org
1979 Contemporary Thought and 1980 General Nonfiction (paperback). There were more than 30 awards for paperback books, 1980 to 1983 only, and The Snow Leopard was the only double winner. "National Book Award Winners: 1950–2009"Archived July 31, 2009, at the Wayback Machine. National Book Foundation: Awards. Retrieved January 5, 2012.
Minnesota State University. "George Schaller". Minnesota State University, Mankato. Archived from the original on September 24, 2007. Retrieved October 5, 2007.
1979 Contemporary Thought and 1980 General Nonfiction (paperback). There were more than 30 awards for paperback books, 1980 to 1983 only, and The Snow Leopard was the only double winner. "National Book Award Winners: 1950–2009"Archived July 31, 2009, at the Wayback Machine. National Book Foundation: Awards. Retrieved January 5, 2012.