एपीए उद्धरण

Ward, B. (1972). Only one earth: The care and maintenance of a small planet. Australia: Penguin Books.

शिकागो स्टाइल उद्धरण

Ward, Barbara. Only One Earth: The Care and Maintenance of a Small Planet. Australia: Penguin Books, 1972.

एमएलए उद्धरण

Ward, Barbara. Only One Earth: The Care and Maintenance of a Small Planet. Australia: Penguin Books, 1972.