एपीए उद्धरण

Ward, B. (1968). Spaceship earth. New York: Columbia University Press.

शिकागो स्टाइल उद्धरण

Ward, Barbara. Spaceship Earth. New York: Columbia University Press, 1968.

एमएलए उद्धरण

Ward, Barbara. Spaceship Earth. New York: Columbia University Press, 1968.