APA استشهاد

Hoel, P. G. (1971). Introduction to mathematical statistics (Ed.4.).

استشهاد بنمط شيكاغو

Hoel, Paul G. Introduction to Mathematical Statistics. Ed.4. New York, john Wiley and Sons, 1971.

MLA استشهاد

Hoel, Paul G. Introduction to Mathematical Statistics. Ed.4. 1971.