Παραπομπή APA

Jeffrey D Ullman Jennifer Widom. (2007). First course in Database systems. Pearson education.

Παραπομπή Chicago Style

Jeffrey D Ullman Jennifer Widom. First Course in Database Systems. Delhi: Pearson education, 2007.

Παραπομπή MLA

Jeffrey D Ullman Jennifer Widom. First Course in Database Systems. Pearson education, 2007.