Παραπομπή APA

Ullman, J. D. (1995). Principles of database systems (2.). Galgotia Publications.

Παραπομπή Chicago Style

Ullman, Jeffrey D. Principles of Database Systems. 2. New Delhi: Galgotia Publications, 1995.

Παραπομπή MLA

Ullman, Jeffrey D. Principles of Database Systems. 2. Galgotia Publications, 1995.