APA استشهاد

Jeffreys, H. (1970). Earth: Its origin, history and physical constitution (5th ed.). Cambridge University Press.

استشهاد بنمط شيكاغو

Jeffreys, Harold. Earth: Its Origin, History and Physical Constitution. 5th ed. Cambridge: Cambridge University Press, 1970.

MLA استشهاد

Jeffreys, Harold. Earth: Its Origin, History and Physical Constitution. 5th ed. Cambridge University Press, 1970.