Brown, L. R. (1990). State of the world: A Worldwatch Institute report on progress toward a sustainable society. W.W. Norton & Co.
Chicago-viite (17. p.)Brown, Lester R. State of the World: A Worldwatch Institute Report on Progress Toward a Sustainable Society. New York: W.W. Norton & Co, 1990.
MLA-viite (9. p.)Brown, Lester R. State of the World: A Worldwatch Institute Report on Progress Toward a Sustainable Society. W.W. Norton & Co, 1990.
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