Cita APA (7a ed.)

Spencer, D., & Vaughan, D. (1997). Teamwork: Student's book 3 (1th. ed.). Heinemann.

Cita Chicago Style (17a ed.)

Spencer, David, y David Vaughan. Teamwork: Student's Book 3. 1th. ed. Oxford: Heinemann, 1997.

Cita MLA (9a ed.)

Spencer, David, y David Vaughan. Teamwork: Student's Book 3. 1th. ed. Heinemann, 1997.