Cita APA

Merdinger, P., & Barton, L. (2009). Northstar 1: Listening and speaking. (2. ed.). New York: Pearson education.

Citación estilo Chicago

Merdinger, Polly, y Laurie Barton. Northstar 1: Listening and Speaking. 2. ed. New York: Pearson education, 2009.

Cita MLA

Merdinger, Polly, y Laurie Barton. Northstar 1: Listening and Speaking. 2. ed. New York: Pearson education, 2009.