Worldwatch Institute, Nierenberg, & Starke. (2005). State of the world 2006: A worldwatch Institute report on progress toward a sustainable society (23rd ed.). Earthscan.
Chicago Style (17th ed.) CitationWorldwatch Institute, Nierenberg, and Starke. State of the World 2006: A Worldwatch Institute Report on Progress Toward a Sustainable Society. 23rd ed. London: Earthscan, 2005.
MLA (8th ed.) CitationWorldwatch Institute, et al. State of the World 2006: A Worldwatch Institute Report on Progress Toward a Sustainable Society. 23rd ed. Earthscan, 2005.
Warning: These citations may not always be 100% accurate.