Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.