Allen, C. (2004). Introduction to relational database and SQL programming. Illinois, USA: Mc GrawHill.
Παραπομπή Chicago StyleAllen, Christopher. Introduction to Relational Database and SQL Programming. Illinois, USA: Mc GrawHill, 2004.
Παραπομπή MLAAllen, Christopher. Introduction to Relational Database and SQL Programming. Illinois, USA: Mc GrawHill, 2004.
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