Cita APA (7a ed.)

Powell, M., & Richardson, K. (2009). In Company: Intermediate (2nd ed.). Macmillan.

Cita Chicago Style (17a ed.)

Powell, Mark, y Karen Richardson. In Company: Intermediate. 2nd ed. Oxford: Macmillan, 2009.

Cita MLA (8a ed.)

Powell, Mark, y Karen Richardson. In Company: Intermediate. 2nd ed. Macmillan, 2009.