Cita APA (7a ed.)
Brown, L. R., & Starke, L. (1989). State of the World 1989: A Worldwatch Institute Report on Progress Toward a Sustainable Society. Norton.
Cita estilo Chicago (17a ed.)
Brown, Lester R., y Linda Starke. State of the World 1989: A Worldwatch Institute Report on Progress Toward a Sustainable Society. Nueva York, EUA: Norton, 1989.
Cita MLA (9a ed.)
Brown, Lester R., y Linda Starke. State of the World 1989: A Worldwatch Institute Report on Progress Toward a Sustainable Society. Norton, 1989.
Precaución: Estas citas no son 100% exactas.