Cita APA (7a ed.)

Harmer, J., & Elsworth, S. (1990). The listening file. Longman.

Cita Chicago Style (17a ed.)

Harmer, Jeremy, y Steve Elsworth. The Listening File. Essex: Longman, 1990.

Cita MLA (8a ed.)

Harmer, Jeremy, y Steve Elsworth. The Listening File. Longman, 1990.