APA (7th ed.) Zitazioa

Worldwatch Institute & Brown, L. R. (1988). State of the world 2001: A Worldwatch Institute report on progress toward a sustainable society. Earthscan.

Chicago Style (17th ed.) Zitazioa

Worldwatch Institute eta Lester Russell Brown. State of the World 2001: A Worldwatch Institute Report on Progress Toward a Sustainable Society. London: Earthscan, 1988.

MLA (9th ed.) Zitazioa

Worldwatch Institute eta Lester Russell Brown. State of the World 2001: A Worldwatch Institute Report on Progress Toward a Sustainable Society. Earthscan, 1988.