एपीए उद्धरण

Napolitano. L. G. (1981). Space: Mankind's Fourth Environment. Pergamon Press.

शिकागो स्टाइल उद्धरण

Napolitano. L. G. Space: Mankind's Fourth Environment. Oxford: Pergamon Press, 1981.

एमएलए उद्धरण

Napolitano. L. G. Space: Mankind's Fourth Environment. Pergamon Press, 1981.