Παραπομπή APA

Gupta, S. (1981). Statistical methods/15e (15th ed.). Sulthan Chand & Sons.

Παραπομπή Chicago Style

Gupta, S.P. Statistical Methods/15e. 15th ed. New Delhi: Sulthan Chand & Sons, 1981.

Παραπομπή MLA

Gupta, S.P. Statistical Methods/15e. 15th ed. Sulthan Chand & Sons, 1981.