APA-referens

Ward, J. A., & Hetzel, H. R. (1980). Biology today and tomorrow. West publishing co.

Chicago-stil citat

Ward, Jack A., och Howard. R. Hetzel. Biology Today and Tomorrow. New York: West publishing co, 1980.

MLA-referens

Ward, Jack A., och Howard. R. Hetzel. Biology Today and Tomorrow. West publishing co, 1980.