Cita APA (7a ed.)

Arnold, J., & Harmer, J. (1978). Advanced writing skills. Longman.

Cita Chicago Style (17a ed.)

Arnold, John, y Jeremy Harmer. Advanced Writing Skills. London: Longman, 1978.

Cita MLA (8a ed.)

Arnold, John, y Jeremy Harmer. Advanced Writing Skills. Longman, 1978.