Cita APA (7a 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..
Cita Chicago Style (17a ed.)
Brown, Lester R., y 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.
Cita MLA (9a ed.)
Brown, Lester R., y Linda Starke. State of the World 1991: A Worldwatch Institute Report on Progress Toward a Sustainable Society. W.W. Norton & Company, Inc., 1991.
Precaución: Estas citas no son 100% exactas.