Gupta, P. K., & Hira, D. S. (2010). Problems in Operations Research: Principles and solutions. S. Chand & Co..
Chicago-čujuhus (17. p.)Gupta, P. K., juo D. S. Hira. Problems in Operations Research: Principles and Solutions. New Delhi: S. Chand & Co., 2010.
MLA-čujuhus (9. p.)Gupta, P. K., juo D. S. Hira. Problems in Operations Research: Principles and Solutions. S. Chand & Co., 2010.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.