APA

Schlickeisen Rodger,, . (1992). The earth ethic. : Defenders Managine.

Chicago

Schlickeisen Rodger,, . 1992. The earth ethic. : Defenders Managine.

Harvard

Schlickeisen Rodger,, . (1992). The earth ethic. : Defenders Managine.

MLA

Schlickeisen Rodger,, . The earth ethic. : Defenders Managine. 1992.