TY  - BOOK
AU  - Date,C.J
AU  - Date,C.J
TI  - An introduction to database systems. 3rd Ed. Vol.1
SN  - 81 85015 58 9
U1  - 004.65 
PY  - 1981///
CY  - New Delhi
PB  - Narosa
KW  - Relational models, Database design
ER  -