Date, C. J., & Darwen, H. (1997). A guide to the SQL standard: A user's guide to the standard database language SQL (4th ed.). Reading, Mass.: Addison-Wesley.
Παραπομπή Chicago StyleDate, C. J., and Hugh Darwen. A Guide to the SQL Standard: A User's Guide to the Standard Database Language SQL. 4th ed. Reading, Mass.: Addison-Wesley, 1997.
Παραπομπή MLADate, C. J., and Hugh Darwen. A Guide to the SQL Standard: A User's Guide to the Standard Database Language SQL. 4th ed. Reading, Mass.: Addison-Wesley, 1997.
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