Parkes, A. . S. (1993). Backlash: A biologist looks at problems of population and the environment. Parkes Foundation.
Chicago-referens (17:e uppl.)Parkes, Alan S. Backlash: A Biologist Looks at Problems of Population and the Environment. Cambridge: Parkes Foundation, 1993.
MLA-referens (9:e uppl.)Parkes, Alan S. Backlash: A Biologist Looks at Problems of Population and the Environment. Parkes Foundation, 1993.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.