Travers, P., Harrison, L., & Chong, C. S. (2015). Collins English for exams: Practice tests for IELTS. Collins.
芝加哥风格引文Travers, Peter, L. Harrison, 与 Chia Suan Chong. Collins English for Exams: Practice Tests for IELTS. London: Collins, 2015.
MLA引文Travers, Peter, et al. Collins English for Exams: Practice Tests for IELTS. Collins, 2015.
警告：这些引文格式不一定是100％准确.