Zimmerman, M. E. (1998). Environmental philosophy: From animal rights to radical ecology (2nd ed.). Prentice Hall.
Chicago-referens (17:e uppl.)Zimmerman, Michael E. Environmental Philosophy: From Animal Rights to Radical Ecology. 2nd ed. Upper Saddle River, N.J: Prentice Hall, 1998.
MLA-referens (9:e uppl.)Zimmerman, Michael E. Environmental Philosophy: From Animal Rights to Radical Ecology. 2nd ed. Prentice Hall, 1998.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.