Gaya APA

Brown, L, R. (1989). State Of The World 1989 : A Worldwatch Institute Report On Progress Toward a Sustainable Society . New York: W.W Norton & Company.

Gaya MLA

Brown, Lester, R. "State Of The World 1989 : A Worldwatch Institute Report On Progress Toward a Sustainable Society". New York: W.W Norton & Company, 1989. Text.