Cita APA (7a ed.)

Ullman, J. D., & Widom, J. (2008). A first course in database systems (3rd ed.). Pearson/Prentice Hall.

Cita Chicago Style (17a ed.)

Ullman, Jeffrey D., y Jennifer Widom. A First Course in Database Systems. 3rd ed. Upper Saddle River, NJ: Pearson/Prentice Hall, 2008.

Cita MLA (9a ed.)

Ullman, Jeffrey D., y Jennifer Widom. A First Course in Database Systems. 3rd ed. Pearson/Prentice Hall, 2008.