Cita APA

Ullman, J. D., & Widom, J. (2011). First course in database systems (2nd.). Pearson.

Chicago Edition Citation

Ullman, Jeffrey D., i Jennifer Widom. First Course in Database Systems. 2nd. New Delhi: Pearson, 2011.

Cita MLA

Ullman, Jeffrey D., i Jennifer Widom. First Course in Database Systems. 2nd. Pearson, 2011.