APA (7th ed.) Citation

U.S. Fish and Wildlife Service. (2000). Wolves in North America. U.S. Fish and Wildlife Service.

Chicago Style (17th ed.) Citation

U.S. Fish and Wildlife Service. Wolves in North America. [Washington, D.C.]: U.S. Fish and Wildlife Service, 2000.

MLA (8th ed.) Citation

U.S. Fish and Wildlife Service. Wolves in North America. U.S. Fish and Wildlife Service, 2000.