Examination papers from University of Cambridge ESOL Examinations: English for speakers of other langusges. (2003). Cambridge Preliminary English test 4 with answers. New York: Cambridge university press.
Trích dẫn kiểu ChicagoExamination papers from University of Cambridge ESOL Examinations: English for speakers of other langusges. Cambridge Preliminary English Test 4 With Answers. New York: Cambridge university press, 2003.
MLA引文Examination papers from University of Cambridge ESOL Examinations: English for speakers of other langusges. Cambridge Preliminary English Test 4 With Answers. New York: Cambridge university press, 2003.
警告：这些引文格式不一定是100％准确.