Cita APA (7a ed.)

Ullman, J. D., & Widom, J. (2002). A First course in database systems (2nd ed.). Prentice Hall.

Cita Chicago Style (17a ed.)

Ullman, Jeffrey D., y Jennifer Widom. A First Course in Database Systems. 2nd ed. Upper Saddle River: Prentice Hall, 2002.

Cita MLA (9a ed.)

Ullman, Jeffrey D., y Jennifer Widom. A First Course in Database Systems. 2nd ed. Prentice Hall, 2002.