TY  - BOOK
AU  - Date,C.J.
TI  - An introduction to database systems
T2  - The systems programming series
SN  - 0-201-51381-1
AV  - QA76.9 .D3 D38 1990
PY  - 1990///
CY  - Reading, Mass.
PB  - Addison-Wesley
N1  - Incluye bibliografia
ER  -