APA aipamena

Barbara Ward. (1972). Only one Earth: The care and maintenance of a small planet. New York: W. W. Norton.

Chicago Style aipamena

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

MLA aipamena

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

Kontuz: berrikusi erreferentzia hauek erabili aurretik.