APA

U.S. Fish and Wildlife Service, . (2003). Waterfowl breeding population survey for South Dakota and North Dakota. Washington, D.C.?: U.S. Fish & Wildlife Service.

Chicago

U.S. Fish and Wildlife Service, . 2003. Waterfowl breeding population survey for South Dakota and North Dakota. Washington, D.C.?: U.S. Fish & Wildlife Service.

Harvard

U.S. Fish and Wildlife Service, . (2003). Waterfowl breeding population survey for South Dakota and North Dakota. Washington, D.C.?: U.S. Fish & Wildlife Service.

MLA

U.S. Fish and Wildlife Service, . Waterfowl breeding population survey for South Dakota and North Dakota. Washington, D.C.?: U.S. Fish & Wildlife Service. 2003.