APA引文

(2006). Cambridge exams extra PET with answers. Cambridge, UK: Cambidge University Press.

Trích dẫn kiểu Chicago

Cambridge Exams Extra PET With Answers. Cambridge, UK: Cambidge University Press, 2006.

MLA引文

Cambridge Exams Extra PET With Answers. Cambridge, UK: Cambidge University Press, 2006.

警告：这些引文格式不一定是100％准确.