Gupta, P. K. (2016). Problems in Operations Research (4th.). S.Chand.
Chicago-čujuhus (17. p.)Gupta, Prem Kumar. Problems in Operations Research. 4th. New Delhi: S.Chand, 2016.
MLA-čujuhus (9. p.)Gupta, Prem Kumar. Problems in Operations Research. 4th. S.Chand, 2016.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.