Groff, J. (2008). SQL: The Complete Reference ,2008 (2 nd.). T M H.
Lua i Stíl Chicago (17ú heag.)Groff, James. SQL: The Complete Reference ,2008. 2 nd. New Delhi: T M H, 2008.
Lua MLA (9ú heag.)Groff, James. SQL: The Complete Reference ,2008. 2 nd. T M H, 2008.
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