Allen, M., Powell, D., & Dolby, D. (2007). IELTS graduation: Student's book. Macmillan.
芝加哥风格引文Allen, Mark, Debra Powell, 与 Dickie Dolby. IELTS Graduation: Student's Book. Oxford: Macmillan, 2007.
MLA引文Allen, Mark, et al. IELTS Graduation: Student's Book. Macmillan, 2007.
警告：这些引文格式不一定是100％准确.