Ward, B., & Dubos, R. J. (1974). Only one Earth: The care and maintenance of a small planet: an unofficial report commissioned by the Secretary-General of the United Nations Conference on the Human Environment. Penguin Books.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Ward, Barbara, و Rene J. Dubos. Only One Earth: The Care and Maintenance of a Small Planet: An Unofficial Report Commissioned by the Secretary-General of the United Nations Conference on the Human Environment. Harmondsworth, England.: Penguin Books, 1974.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Ward, Barbara, و Rene J. Dubos. Only One Earth: The Care and Maintenance of a Small Planet: An Unofficial Report Commissioned by the Secretary-General of the United Nations Conference on the Human Environment. Penguin Books, 1974.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.