TY  - BOOK
AU  - Codd, EF.
TI  - The Relational model for database management
SN  - 0-201-14192-2
AV  - QA76.9.D3C626 1990 
PY  - 1990///
CY  - Reading, Massachusetts
PB  - Addison-Wesley Publishing Company
KW  - Data base management
KW  - Relational databases
N1  - Includes bibliographical references and index
ER  -