Cita APA (7a ed.)

Thornbury, S. (2011). How to teach speaking (9th impression.). Longman.

Cita Chicago Style (17a ed.)

Thornbury, Scott. How to Teach Speaking. 9th impression. Harlow: Longman, 2011.

Cita MLA (9a ed.)

Thornbury, Scott. How to Teach Speaking. 9th impression. Longman, 2011.