Cita APA (7th ed.)
Gruber, M. (1995). Understanding sql. BPB Pub.
Cita Chicago (17th ed.)
Gruber, Martin. Understanding Sql. New Delhi: BPB Pub, 1995.
Cita MLA (9th ed.)
Gruber, Martin. Understanding Sql. BPB Pub, 1995.
Atenció: Aquestes cites poden no estar 100% correctes.