Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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