Cita APA (7a ed.)
Brown, L. R. (1989). State of the world 1989: A worldwatch institute report on progress toward a sustainable society. W.W. Norton & Co..
Cita Chicago Style (17a ed.)
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.
Cita MLA (9a ed.)
Brown, Lester R. State of the World 1989: A Worldwatch Institute Report on Progress Toward a Sustainable Society. W.W. Norton & Co., 1989.
Precaución: Estas citas no son 100% exactas.