519 SHARMA, J . K . OPERATIONS RESEARCH , THEORY AND APPLICATIONS / / J . K . SHARMA. - 2ND ED. - DELHI: : MACMILLAN,, 2003. xxiv , 1106 P.. : PAPER BACK 4TH ED / 2009 / xviii , 958 P ; 5TH ED / 2013 / xviii , 944 P / 495/- ; 595/- ; 6TH ED / 2016 / xviii , 943 P / 650/-. 9789385935145 978-9350-59336-3 : 650/- * OPERATION RESEARCH.