Gaya APA

Environmental ethics [rekaman video] : constructive approaches to difficult issues / by Group Four Teleproductions. (1994). : Durango, Colo., Group Four Teleproduction.

Gaya MLA

Environmental ethics [rekaman video] : constructive approaches to difficult issues / by Group Four Teleproductions. . : Durango, Colo., Group Four Teleproduction, 1994. Text.