Gupta, S. (2002). Statistical methods. S.Chand & Sons.
Chicago-čujuhus (17. p.)Gupta, S.P. Statistical Methods. New Delhi: S.Chand & Sons, 2002.
MLA-čujuhus (9. p.)Gupta, S.P. Statistical Methods. S.Chand & Sons, 2002.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.