Gaya APA
Desjardins, J, R. (2013).
Enviromental ethics : an introduction to environtmental philosophy .
Wadsworth.:
Wadsworth : Cengage, 2013.
Gaya MLA
Desjardins, Joseph, R..
"Enviromental ethics : an introduction to environtmental philosophy".
Wadsworth.:
Wadsworth : Cengage, 2013,
2013.
Text.