APA (7th ed.) Zitazioa

Brown, L. R. (1989). State of the world 1989: A worldwatch institute report on progress toward a sustainable society. W.W. Norton & Co..

Chicago Style (17th ed.) Zitazioa

Brown, Lester R. State of the World 1989: A Worldwatch Institute Report on Progress Toward a Sustainable Society. New York: W.W. Norton & Co., 1989.

MLA (9th ed.) Zitazioa

Brown, Lester R. State of the World 1989: A Worldwatch Institute Report on Progress Toward a Sustainable Society. W.W. Norton & Co., 1989.