APA citiranje

Ward, B. (1972). Only the earth: The care and maintenance of a small planet. New York: Pengiun Books.

Trích dẫn kiểu Chicago

Ward, Barbara. Only the Earth: The Care and Maintenance of a Small Planet. New York: Pengiun Books, 1972.

MLA citiranje

Ward, Barbara. Only the Earth: The Care and Maintenance of a Small Planet. New York: Pengiun Books, 1972.