U.S. Fish and Wildlife Service. (1999). Turnbull National Wildlife Refuge: Birds of Turnbull. U.S. Fish and Wildlife Service.
Chicago Style (17th ed.) CitationU.S. Fish and Wildlife Service. Turnbull National Wildlife Refuge: Birds of Turnbull. [Washington, D.C.?]: U.S. Fish and Wildlife Service, 1999.
MLA (9th ed.) CitationU.S. Fish and Wildlife Service. Turnbull National Wildlife Refuge: Birds of Turnbull. U.S. Fish and Wildlife Service, 1999.
Warning: These citations may not always be 100% accurate.