TY  - BOOK
AU  - Deitel, Harvey M.
AU  - Deitel, Paul J.
AU  - Choffnes, David R.
TI  - Operating system.-3rd ed
SN  - 9788131712894
U1  - 004.451 DEI 
PY  - 2013///
CY  - New Delhi
PB  - Pearson
ER  -