Cita APA (7a ed.)

Harmer, J. (1991). The practice of English language teaching (New ed.). Longman.

Cita Chicago Style (17a ed.)

Harmer, Jeremy. The Practice of English Language Teaching. New ed. London [etc.]: Longman, 1991.

Cita MLA (9a ed.)

Harmer, Jeremy. The Practice of English Language Teaching. New ed. Longman, 1991.