TY  - BOOK
AU  - Ullman, Jeffrey.
AU  - Widom, Jennifer.
TI  - A first course in database systems
SN  - 0138613370
PY  - 1997///
CY  - Upper Saddle River, N.J.
PB  -  : Prentice-Hall
KW  -  BASE DE DATOS
ER  -