Cita APA (7a ed.)

Doff, A., & Becket, C. Listening 1 (4a ed.).

Cita Chicago Style (17a ed.)

Doff, Adrian, y Carolyn Becket. Listening 1. 4a ed.

Cita MLA (8a ed.)

Doff, Adrian, y Carolyn Becket. Listening 1. 4a ed.