APA (7th ed.) Citation

Hallows, R., Lisboa, M., & Unwin, M. (2006). IELTS express series. Thomson.

Chicago Style (17th ed.) Citation

Hallows, Richard, Martin Lisboa, and Mark Unwin. IELTS Express Series. Australia: Thomson, 2006.

MLA (9th ed.) Citation

Hallows, Richard, et al. IELTS Express Series. Thomson, 2006.