Cita APA (7a ed.)

Harmer, J., & Arnold, J. (1980). Advanced speaking skills. Eurocentre : Longman.

Cita Chicago Style (17a ed.)

Harmer, Jeremy, y John Arnold. Advanced Speaking Skills. London: Eurocentre : Longman, 1980.

Cita MLA (9a ed.)

Harmer, Jeremy, y John Arnold. Advanced Speaking Skills. Eurocentre : Longman, 1980.