APA استشهاد

Kemmer, N. (1964). theory of space, time and gravitation. Pergamon Press.

استشهاد بنمط شيكاغو

Kemmer, N. Theory of Space, Time and Gravitation. Oxford: Pergamon Press, 1964.

MLA استشهاد

Kemmer, N. Theory of Space, Time and Gravitation. Pergamon Press, 1964.