Patrick, J. J. (1999). SQL fundamentals. Prentice Hall PTR.
Lua i Stíl Chicago (17ú heag.)Patrick, John J. SQL Fundamentals. Upper Saddle River, NJ: Prentice Hall PTR, 1999.
Lua MLA (9ú heag.)Patrick, John J. SQL Fundamentals. Prentice Hall PTR, 1999.
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