Pratt, P. J. (2001). A guide to SQL (5th ed.). Jemma.
Lua i Stíl Chicago (17ú heag.)Pratt, Philip J. A Guide to SQL. 5th ed. Rizal: Jemma, 2001.
Lua MLA (9ú heag.)Pratt, Philip J. A Guide to SQL. 5th ed. Jemma, 2001.
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