Ward, B., & Dubos, R. J. (1972). Only one earth: The care and maintenance of a small planet (First edition.). Norton & Company.
Lua i Stíl Chicago (17ú heag.)Ward, Barbara, agus René J. Dubos. Only One Earth: The Care and Maintenance of a Small Planet. First edition. New York: Norton & Company, 1972.
Lua MLA (8ú heag.)Ward, Barbara, agus René J. Dubos. Only One Earth: The Care and Maintenance of a Small Planet. First edition. Norton & Company, 1972.
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