Cita APA

Ferree, T., & Sanabria, K. (2009). Northstar 4: Listening and speaking (1. ed.). New York: Pearson education.

Citación estilo Chicago

Ferree, Tess, y Kim Sanabria. Northstar 4: Listening and Speaking. 1. ed. New York: Pearson education, 2009.

Cita MLA

Ferree, Tess, y Kim Sanabria. Northstar 4: Listening and Speaking. 1. ed. New York: Pearson education, 2009.