Worldwatch Institute, Brown, L. R., Flavin, C., .French, H. F., Starke, L., & .Abramovitz, J. N. (1997). State of the world, 1997: A Worldwatch Institute report on progress toward a sustainable society. Norton.
Chicago-referens (17:e uppl.)Worldwatch Institute, Lester Russell Brown, Christopher Flavin, Hilary F. .French, Linda Starke, och Janet N. .Abramovitz. State of the World, 1997: A Worldwatch Institute Report on Progress Toward a Sustainable Society. New York: Norton, 1997.
MLA-referens (9:e uppl.)Worldwatch Institute, et al. State of the World, 1997: A Worldwatch Institute Report on Progress Toward a Sustainable Society. Norton, 1997.
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