Παραπομπή APA

Gupta,S P. (1960). Statistical methods/15th ed (15th ed.). Sultha Chand and sons.

Παραπομπή Chicago Style

Gupta,S P. Statistical Methods/15th Ed. 15th ed. New Delhi: Sultha Chand and sons, 1960.

Παραπομπή MLA

Gupta,S P. Statistical Methods/15th Ed. 15th ed. Sultha Chand and sons, 1960.