Vandeveer,Donald Pierce, C. (2003). The environmental ethics & policy book (Third.). Holly Allen.
Lua i Stíl Chicago (17ú heag.)Vandeveer,Donald Pierce, Christine. The Environmental Ethics & Policy Book. Third. Canada: Holly Allen, 2003.
Lua MLA (8ú heag.)Vandeveer,Donald Pierce, Christine. The Environmental Ethics & Policy Book. Third. Holly Allen, 2003.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.