Zimmerman, M. E. (1998). Environmental philosophy: From animal rights to radical ecology (2nd ed.). Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Zimmerman, Michael E. Environmental Philosophy: From Animal Rights to Radical Ecology. 2nd ed. Upper Saddle River, N.J: Prentice Hall, 1998.
Lua MLA (9ú heag.)Zimmerman, Michael E. Environmental Philosophy: From Animal Rights to Radical Ecology. 2nd ed. Prentice Hall, 1998.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.