Roberts, R., Gakonga, J., & Preshous, A. (2004). IELTS foundation: Student's book. Macmillan Education.
芝加哥风格引文Roberts, Rachael, Joanne Gakonga, 与 Andrew Preshous. IELTS Foundation: Student's Book. Oxford: Macmillan Education, 2004.
MLA引文Roberts, Rachael, et al. IELTS Foundation: Student's Book. Macmillan Education, 2004.
警告：这些引文格式不一定是100％准确.