Cita APA (7th ed.)

Thornbury, S. (2007). How to: Teach speaking (4a. ed.). Pearson Education.

Cita Chicago (17th ed.)

Thornbury, Scott. How to: Teach Speaking. 4a. ed. Essex: Pearson Education, 2007.

Cita MLA (9th ed.)

Thornbury, Scott. How to: Teach Speaking. 4a. ed. Pearson Education, 2007.