APA (7th ed.) Citation

U.S. Fish and Wildlife Service. (2001). Endangered species facts (Updated May, 2001.). U.S. Fish and Wildlife Service.

Chicago Style (17th ed.) Citation

U.S. Fish and Wildlife Service. Endangered Species Facts. Updated May, 2001. [Washington, D.C.]: U.S. Fish and Wildlife Service, 2001.

MLA (9th ed.) Citation

U.S. Fish and Wildlife Service. Endangered Species Facts. Updated May, 2001. U.S. Fish and Wildlife Service, 2001.