Pratt, P. J. (2001). A guide to SQL (5th ed.). Jemma.
Cita Chicago (17th ed.)Pratt, Philip J. A Guide to SQL. 5th ed. Rizal: Jemma, 2001.
Cita MLA (9th ed.)Pratt, Philip J. A Guide to SQL. 5th ed. Jemma, 2001.
Atenció: Aquestes cites poden no estar 100% correctes.