APA استشهاد

Ward,Barbara, & Dubos,Rene. (1972). Only one earth: The care and maintenance of a small planet. W W Norton and Company.

استشهاد بنمط شيكاغو

Ward,Barbara, و Dubos,Rene. Only One Earth: The Care and Maintenance of a Small Planet. New York: W W Norton and Company, 1972.

MLA استشهاد

Ward,Barbara, و Dubos,Rene. Only One Earth: The Care and Maintenance of a Small Planet. W W Norton and Company, 1972.