Cullen, P., French, A., & Jakeman, V. (2014). The official Cambridge guide to IELTS: For academic & general training : student's book with answers. Cambridge University Press : Cambridge English Language Assessment.
芝加哥风格引文Cullen, Pauline, Amanda French, 与 Vanessa Jakeman. The Official Cambridge Guide to IELTS: For Academic & General Training : Student's Book with Answers. [Cambridge, England]: Cambridge University Press : Cambridge English Language Assessment, 2014.
MLA引文Cullen, Pauline, et al. The Official Cambridge Guide to IELTS: For Academic & General Training : Student's Book with Answers. Cambridge University Press : Cambridge English Language Assessment, 2014.
警告：这些引文格式不一定是100％准确.