Ward, B. (1972). Only the earth: The care and maintenance of a small planet. New York: Pengiun Books.
Chicago-stil citatWard, Barbara. Only the Earth: The Care and Maintenance of a Small Planet. New York: Pengiun Books, 1972.
MLA-referensWard, Barbara. Only the Earth: The Care and Maintenance of a Small Planet. New York: Pengiun Books, 1972.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.