Worldwatch Institute & Brown, L. R. (1993). State of the world, 1993: A Worldwatch Institute report on progress toward a sustainable society. Norton.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWorldwatch Institute और Lester Russell Brown. State of the World, 1993: A Worldwatch Institute Report on Progress Toward a Sustainable Society. New York: Norton, 1993.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWorldwatch Institute और Lester Russell Brown. State of the World, 1993: A Worldwatch Institute Report on Progress Toward a Sustainable Society. Norton, 1993.
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