This final section lists references to printed books and articles, not available on the Internet.

(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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