Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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