APA (7th ed.) Citation

U.S. Fish and Wildlife Service. (1989). Emperors on the move. [U.S. Fish and Wildlife Service].

Chicago Style (17th ed.) Citation

U.S. Fish and Wildlife Service. Emperors on the Move. [Washington, D.C.?]: [U.S. Fish and Wildlife Service], 1989.

MLA (9th ed.) Citation

U.S. Fish and Wildlife Service. Emperors on the Move. [U.S. Fish and Wildlife Service], 1989.