C. L. Liu, . (2000). Elements Of Discerete Mathematics. New Delhi: Tata Macgraw-Hill.
C. L. Liu, . 2000. Elements Of Discerete Mathematics. New Delhi: Tata Macgraw-Hill.
C. L. Liu, . Elements Of Discerete Mathematics. New Delhi: Tata Macgraw-Hill. 2000.
