APA引文

Williams, A. (2012). Vocabulary for IELTS. HarperCollins Publishers.

芝加哥风格引文

Williams, Anneli. Vocabulary for IELTS. London: HarperCollins Publishers, 2012.

MLA引文

Williams, Anneli. Vocabulary for IELTS. HarperCollins Publishers, 2012.

警告：这些引文格式不一定是100％准确.