APA (7th ed.) Citation

Hallows, R., Lisboa, M., & Unwin, M. IELTS express Intermediate. Thomson.

Chicago Style (17th ed.) Citation

Hallows, Richard, Martin Lisboa, and Mark Unwin. IELTS Express Intermediate. London: Thomson.

MLA (9th ed.) Citation

Hallows, Richard, et al. IELTS Express Intermediate. Thomson.