Cullen,, P. (2008). Vocabulary for IELTS with answers. CUP.
Chicago Edition CitationCullen,, Pauline. Vocabulary for IELTS with Answers. CUP, 2008.
MLA引文Cullen,, Pauline. Vocabulary for IELTS with Answers. CUP, 2008.
警告：这些引文格式不一定是100％准确.
APA引文