APA استشهاد

Hawking, S. W. (2001). universe in a nutshell. Bantam Press.

استشهاد بنمط شيكاغو

Hawking, Stephen W. Universe in a Nutshell. London: Bantam Press, 2001.

MLA استشهاد

Hawking, Stephen W. Universe in a Nutshell. Bantam Press, 2001.