Gupta, S. (2002). Statistical methods. S.Chand & Sons.
Lua i Stíl Chicago (17ú heag.)Gupta, S.P. Statistical Methods. New Delhi: S.Chand & Sons, 2002.
Lua MLA (9ú heag.)Gupta, S.P. Statistical Methods. S.Chand & Sons, 2002.
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