APA

Kortright F. H., Shortt T. M. & American Wildlife Institute. (1943). The ducks, geese and swans of North America. Washington, D.C: American Wildlife Institute.

Chicago

Kortright Francis H, Shortt T M and American Wildlife Institute. 1943. The ducks, geese and swans of North America. Washington, D.C: American Wildlife Institute.

Harvard

Kortright F. H., Shortt T. M. and American Wildlife Institute. (1943). The ducks, geese and swans of North America. Washington, D.C: American Wildlife Institute.

MLA

Kortright Francis H, Shortt T M and American Wildlife Institute. The ducks, geese and swans of North America. Washington, D.C: American Wildlife Institute. 1943.