Ward, B., & Dubos, R. J. (1972). Only one earth: The care and maintenance of a small planet (First edition.). Norton & Company.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWard, Barbara, और René J. Dubos. Only One Earth: The Care and Maintenance of a Small Planet. First edition. New York: Norton & Company, 1972.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWard, Barbara, और René J. Dubos. Only One Earth: The Care and Maintenance of a Small Planet. First edition. Norton & Company, 1972.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.