Παραπομπή APA

Gupta, S. (1989). Statistical methods. Sultan Chand & Sons.

Παραπομπή Chicago Style

Gupta, S.P. Statistical Methods. New Delhi: Sultan Chand & Sons, 1989.

Παραπομπή MLA

Gupta, S.P. Statistical Methods. Sultan Chand & Sons, 1989.