Cita APA (7th ed.)

Freire, R., Jones, M. A., Zwier,Lawrence J, & Zimmerman, C. B. (2011). Listening and speaking. Oxford Univ Press.

Cita Chicago (17th ed.)

Freire, Robert, Marguerite Ann Jones, Zwier,Lawrence J, i Cheryl Boyd Zimmerman. Listening and Speaking. Oxford ; New York: Oxford Univ Press, 2011.

Cita MLA (8th ed.)

Freire, Robert, et al. Listening and Speaking. Oxford Univ Press, 2011.