TY  - BOOK
AU  - Deitel,Harvey M.
AU  - Deitel,Paul J.
AU  - Choffnes,David R.
TI  - Operating systems / 
SN  - 9788131712894
U1  - 005.43/ D325o 23
PY  - 2019///
CY  - New Delhi
PB  - Pearson education
KW  - Operating systems (Computers)
ER  -