APA استشهاد

PostLethwait John. (1994). The nature of life (4th ed.). Mc Graw Hill.

استشهاد بنمط شيكاغو

PostLethwait John. The Nature of Life. 4th ed. New York: Mc Graw Hill, 1994.

MLA استشهاد

PostLethwait John. The Nature of Life. 4th ed. Mc Graw Hill, 1994.