LEON, A. (1999). SQL: A COMPLETE REFRENCE. TATA MC-GRAW HILL PUBLISHING CO.LTD.
Cita Chicago (17th ed.)LEON, A. SQL: A COMPLETE REFRENCE. NEW DELHI: TATA MC-GRAW HILL PUBLISHING CO.LTD, 1999.
Cita MLA (9th ed.)LEON, A. SQL: A COMPLETE REFRENCE. TATA MC-GRAW HILL PUBLISHING CO.LTD, 1999.
Atenció: Aquestes cites poden no estar 100% correctes.