GUPTA PREM KUMAR. (2009). OPERATION RESEARCH. Issued.
Chicago-čujuhus (17. p.)GUPTA PREM KUMAR. OPERATION RESEARCH. NEW DELHI: Issued, 2009.
MLA-čujuhus (9. p.)GUPTA PREM KUMAR. OPERATION RESEARCH. Issued, 2009.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.