APA-referens (7:e uppl.)
Caro, T. M., & Girling, S. (2010). Conservation by proxy: Indicator, umbrella, keystone, flagship, and other surrogate species. Island Press.
Chicago-referens (17:e uppl.)
Caro, T. M., och Sheila Girling. Conservation by Proxy: Indicator, Umbrella, Keystone, Flagship, and Other Surrogate Species. Washington, DC: Island Press, 2010.
MLA-referens (9:e uppl.)
Caro, T. M., och Sheila Girling. Conservation by Proxy: Indicator, Umbrella, Keystone, Flagship, and Other Surrogate Species. Island Press, 2010.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.