APA استشهاد

Hoel, P. G., & Port, S. C. S. (1991). Introduction to probability theory. Universal.

استشهاد بنمط شيكاغو

Hoel, Paul G., و Sidney C Stone Port. Introduction to Probability Theory. New Delhi: Universal, 1991.

MLA استشهاد

Hoel, Paul G., و Sidney C Stone Port. Introduction to Probability Theory. Universal, 1991.