APA (7th ed.) Citation

Olson, K. (1989). A summer in the life of wild mallards. [U.S. Fish and Wildlife Service].

Chicago Style (17th ed.) Citation

Olson, Kent. A Summer in the Life of Wild Mallards. [Washington, D.C.]: [U.S. Fish and Wildlife Service], 1989.

MLA (9th ed.) Citation

Olson, Kent. A Summer in the Life of Wild Mallards. [U.S. Fish and Wildlife Service], 1989.