Cita APA (7a ed.)

Hallows, R., Lisboa, M., & Unwin, M. (2006). IELTS express: Intermediate. Thompson.

Cita Chicago Style (17a ed.)

Hallows, Richard, Martin Lisboa, y Mark Unwin. IELTS Express: Intermediate. Boston, Mass.: Thompson, 2006.

Cita MLA (9a ed.)

Hallows, Richard, et al. IELTS Express: Intermediate. Thompson, 2006.