Tohutoro APA (7th ed.)
Brown, L. R., & Starke, L. (1991). State of the world 1991: A Worldwatch Institute Report on progress toward a sustainable society. W.W. Norton & Company, Inc..
Tohutoru Kātū Chicago (17th ed.)
Brown, Lester R., me Linda Starke. State of the World 1991: A Worldwatch Institute Report on Progress Toward a Sustainable Society. New York: W.W. Norton & Company, Inc., 1991.
Tohutoro MLA (9th ed.)
Brown, Lester R., me Linda Starke. State of the World 1991: A Worldwatch Institute Report on Progress Toward a Sustainable Society. W.W. Norton & Company, Inc., 1991.
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