Gupta, S. (1981). Statistical methods/15e (15th ed.). Sulthan Chand & Sons.
Chicago Style aipamenaGupta, S.P. Statistical Methods/15e. 15th ed. New Delhi: Sulthan Chand & Sons, 1981.
MLA aipamenaGupta, S.P. Statistical Methods/15e. 15th ed. Sulthan Chand & Sons, 1981.
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