LEON, A. (1999). SQL: A COMPLETE REFRENCE. TATA MC-GRAW HILL PUBLISHING CO.LTD.
Lua i Stíl Chicago (17ú heag.)LEON, A. SQL: A COMPLETE REFRENCE. NEW DELHI: TATA MC-GRAW HILL PUBLISHING CO.LTD, 1999.
Lua MLA (9ú heag.)LEON, A. SQL: A COMPLETE REFRENCE. TATA MC-GRAW HILL PUBLISHING CO.LTD, 1999.
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