Cita APA (7th ed.)

Harmer, J. (2001). The practice of english language teaching (3a. ed.). Longman.

Cita Chicago (17th ed.)

Harmer, Jeremy. The Practice of English Language Teaching. 3a. ed. Essex: Longman, 2001.

Cita MLA (9th ed.)

Harmer, Jeremy. The Practice of English Language Teaching. 3a. ed. Longman, 2001.