Groff, J. (2006). SQL. Tata Mc-Graw Hill.
Lua i Stíl Chicago (17ú heag.)Groff, James. SQL. New Delhi: Tata Mc-Graw Hill, 2006.
Lua MLA (9ú heag.)Groff, James. SQL. Tata Mc-Graw Hill, 2006.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.