Gupta, S. P. (2017). Statistical Methods (45th rev. ed.). Sultan Chand & Sons.
Cita Chicago (17th ed.)Gupta, S. P. Statistical Methods. 45th rev. ed. New Delhi: Sultan Chand & Sons, 2017.
Cita MLA (9th ed.)Gupta, S. P. Statistical Methods. 45th rev. ed. Sultan Chand & Sons, 2017.
Atenció: Aquestes cites poden no estar 100% correctes.