Gupta S.P. (2018). Statistical Methods (45th ed.). Sultan Chand & Sons.
Chicago-čujuhus (17. p.)Gupta S.P. Statistical Methods. 45th ed. New Delhi: Sultan Chand & Sons, 2018.
MLA-čujuhus (9. p.)Gupta S.P. Statistical Methods. 45th ed. Sultan Chand & Sons, 2018.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.