Cita APA (7th ed.)
Brown, L. R., & Starke, L. (1994). State of the World l994: A Worldwatch Institute Report on Progress Toward a Sustainable Society.
Cita Chicago (17th ed.)
Brown, Lester R., i Linda Starke. State of the World L994: A Worldwatch Institute Report on Progress Toward a Sustainable Society. 1994.
Cita MLA (9th ed.)
Brown, Lester R., i Linda Starke. State of the World L994: A Worldwatch Institute Report on Progress Toward a Sustainable Society. 1994.
Atenció: Aquestes cites poden no estar 100% correctes.