APA استشهاد

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

استشهاد بنمط شيكاغو

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

MLA استشهاد

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