S.P.Gupta. (2019). Statistical Methods (45th ed.). Sultan Chand & Sons.
Chicago-čujuhus (17. p.)S.P.Gupta. Statistical Methods. 45th ed. Delhi: Sultan Chand & Sons, 2019.
MLA-čujuhus (9. p.)S.P.Gupta. Statistical Methods. 45th ed. Sultan Chand & Sons, 2019.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.