TY  - BOOK
AU  - Ullman, Jeffrey D.
TI  - Principles of database systems
U1  - 005.74 
PY  - 1988///
CY  - New Delhi
PB  - Galgotia
KW  - Computer programming
KW  - Programs
KW  - Data
KW  - Data files
KW  - Databases
ER  -