Cita APA (7th ed.)

Worldwatch Institute, Gardner, G. T., Bright, C., & Starke, L. (2003). State of the world, 2003: A Worldwatch Institute report on progress toward a sustainable society ([20th ed.].). Earthscan.

Cita Chicago (17th ed.)

Worldwatch Institute, Gary T. Gardner, Chris Bright, i Linda Starke. State of the World, 2003: A Worldwatch Institute Report on Progress Toward a Sustainable Society. [20th ed.]. London: Earthscan, 2003.

Cita MLA (9th ed.)

Worldwatch Institute, et al. State of the World, 2003: A Worldwatch Institute Report on Progress Toward a Sustainable Society. [20th ed.]. Earthscan, 2003.