APA (7th ed.) Citation

Harrison, M., & Whitehead, R. (2015). IELTS 1: Exam essentials practice tests. Change Learning.

Chicago Style (17th ed.) Citation

Harrison, Mark, and Russell Whitehead. IELTS 1: Exam Essentials Practice Tests. Hampshire, United Kingdom: Change Learning, 2015.

MLA (9th ed.) Citation

Harrison, Mark, and Russell Whitehead. IELTS 1: Exam Essentials Practice Tests. Change Learning, 2015.