University of Cambridge. (2007). Cambridge preliminary English test 4 with answers: Examination papers from University of Cambridge ESOL examinations: English for Speakers of Other Languages. New York: Cambridge university press.
Trích dẫn kiểu ChicagoUniversity of Cambridge. Cambridge Preliminary English Test 4 With Answers: Examination Papers From University of Cambridge ESOL Examinations: English for Speakers of Other Languages. New York: Cambridge university press, 2007.
Deismireacht MLAUniversity of Cambridge. Cambridge Preliminary English Test 4 With Answers: Examination Papers From University of Cambridge ESOL Examinations: English for Speakers of Other Languages. New York: Cambridge university press, 2007.
Rabhadh: D'fhéadfadh nach mbeadh na deismireachtaí seo 100% cruinn i gcónaí.