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Dyfyniad Arddull ChicagoWorldwatch Institute, Gary T. Gardner, Chris Bright, and Linda Starke. State of the World, 1996: A Worldwatch Institute Report on Progress Toward a Sustainable Society. New York: W.W. Norton & Co., 1996.
Dyfyniad MLAWorldwatch Institute, et al. State of the World, 1996: A Worldwatch Institute Report on Progress Toward a Sustainable Society. W.W. Norton & Co., 1996.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.