Cita APA

Solórzano, H. S., & Schmidt, J. P. (2009). Northstar 3: Listening and speaking. (3. ed.). New York: Pearson education.

Citación estilo Chicago

Solórzano, Helen S., y Jennifer P.L Schmidt. Northstar 3: Listening and Speaking. 3. ed. New York: Pearson education, 2009.

Cita MLA

Solórzano, Helen S., y Jennifer P.L Schmidt. Northstar 3: Listening and Speaking. 3. ed. New York: Pearson education, 2009.