ULLMAN J.D. (1992). PRINCIPAL OF DATA BASE SYSTEM. GALGOTIA PUB.
Cita Chicago (17th ed.)ULLMAN J.D. PRINCIPAL OF DATA BASE SYSTEM. GALGOTIA PUB, 1992.
Cita MLA (9th ed.)ULLMAN J.D. PRINCIPAL OF DATA BASE SYSTEM. GALGOTIA PUB, 1992.
Atenció: Aquestes cites poden no estar 100% correctes.