APA

Carney S. M., U.S. Fish and Wildlife Service, .Species, age, and sex identification of ducks using wing plumage. Washington: U.S. Fish and Wildlife Service, 1992.

Chicago

Carney Samuel M, U.S. Fish and Wildlife Service, .Species, age, and sex identification of ducks using wing plumage. Washington: U.S. Fish and Wildlife Service, 1992.

Harvard

Carney S. M., U.S. Fish and Wildlife Service, .Species, age, and sex identification of ducks using wing plumage. Washington: U.S. Fish and Wildlife Service, 1992.

MLA

Carney Samuel M, U.S. Fish and Wildlife Service, .Washington: U.S. Fish and Wildlife Service, 1992. .