APA استشهاد

Cochran, W. G. (1987). Sampling techniques (3.). Wiley Eastern Ltd.

استشهاد بنمط شيكاغو

Cochran, William G. Sampling Techniques. 3. New Delhi: Wiley Eastern Ltd, 1987.

MLA استشهاد

Cochran, William G. Sampling Techniques. 3. Wiley Eastern Ltd, 1987.