(1990). State of the world 1990, a world in watch institute report on progress toward a sustainable society. Unwin.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रState of the World 1990, a World in Watch Institute Report on Progress Toward a Sustainable Society. Unwin, 1990.
एमएलए (9वां संस्करण) प्रशस्ति पत्रState of the World 1990, a World in Watch Institute Report on Progress Toward a Sustainable Society. Unwin, 1990.
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