Cita APA (7th ed.)
Ullman, J. D. (2002). Principles of database systems (2nd ed.). Galgotia Pub.
Cita Chicago (17th ed.)
Ullman, Jeffrey D. Principles of Database Systems. 2nd ed. New Delhi: Galgotia Pub, 2002.
Cita MLA (9th ed.)
Ullman, Jeffrey D. Principles of Database Systems. 2nd ed. Galgotia Pub, 2002.
Atenció: Aquestes cites poden no estar 100% correctes.