GROFF JAMES R. (2003). SQL: COMPLETE REFERENCE 2ND ED. WITH CD (2ND ED.). TATA MCGRAW-HILL PUBLISHING COMPANY LIMITED.
Chicago-viite (17. p.)GROFF JAMES R. SQL: COMPLETE REFERENCE 2ND ED. WITH CD. 2ND ED. NEW DELHI: TATA MCGRAW-HILL PUBLISHING COMPANY LIMITED, 2003.
MLA-viite (9. p.)GROFF JAMES R. SQL: COMPLETE REFERENCE 2ND ED. WITH CD. 2ND ED. TATA MCGRAW-HILL PUBLISHING COMPANY LIMITED, 2003.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.