APA

Bartonek J. C., Nettleship D. N., . (1979). Conservation of marine birds of northern North America. Washington, D.C: U.S. Dept. of the Interior, Fish and Wildlife Service.

Chicago

Bartonek James C, Nettleship David N, . 1979. Conservation of marine birds of northern North America. Washington, D.C: U.S. Dept. of the Interior, Fish and Wildlife Service.

Harvard

Bartonek J. C., Nettleship D. N., . (1979). Conservation of marine birds of northern North America. Washington, D.C: U.S. Dept. of the Interior, Fish and Wildlife Service.

MLA

Bartonek James C, Nettleship David N, . Conservation of marine birds of northern North America. Washington, D.C: U.S. Dept. of the Interior, Fish and Wildlife Service. 1979.