Allen, M., Powell, D., & Dolby, D. (2007). IELTS graduation: Student's book. Macmillan.
Chicagoスタイル(17版)引用形式Allen, Mark, Debra Powell, , Dickie Dolby. IELTS Graduation: Student's Book. Oxford: Macmillan, 2007.
MLA(8版)引用形式Allen, Mark, et al. IELTS Graduation: Student's Book. Macmillan, 2007.
警告: この引用は必ずしも正確ではありません.