Cooke, W. W. (1906). Distribution and migration of North American ducks, geese, and swans. Government Printing Office.
Chicago-Zitierstil (17. Ausg.)Cooke, Wells W.. Distribution and Migration of North American Ducks, Geese, and Swans. Washington: Government Printing Office, 1906.
MLA-Zitierstil (9. Ausg.)Cooke, Wells W.. Distribution and Migration of North American Ducks, Geese, and Swans. Government Printing Office, 1906.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.