(1) Codd, E. F. "A Relational Model of Data for Large Shared Data Banks", Communications of the ACM, vol. 13 #6 (June, 1970).
(2) Codd, E. F. "Extending the Database Relational Model to Capture More Meaning", ACM Transactions on Database Systems, vol. 4 #4 (December, 1979).
(3) Codd, E. F. "Is Your DBMS Really Relational?", ComputerWorld, (Part 1: October 14, 1985, Part 2: October 21, 1985).
(4) Codd, E. F. The Relational Model of Database Management Version 2. Buy this book from Amazon
(5) Ratliffe, Wayne, "Interview", DBMS Magazine, vol. 1 #4 (December 1988).
(6) Pascal, Fabian SQL and Relational Basics. Buy this book from Amazon
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