APA (7th ed.) Citation

Travers, P., Harrison, L., & Chong, C. S. (2015). Collins English for exams: Practice tests for IELTS. Collins.

Chicago Style (17th ed.) Citation

Travers, Peter, L. Harrison, and Chia Suan Chong. Collins English for Exams: Practice Tests for IELTS. London: Collins, 2015.

MLA (9th ed.) Citation

Travers, Peter, et al. Collins English for Exams: Practice Tests for IELTS. Collins, 2015.