University of Cambridge. (2010). Cambridge preliminary English test with schools 1 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 With Schools 1 With Answers: Examination Papers From University of Cambridge ESOL Examinations: English for Speakers of Other Languages. New York: Cambridge university press, 2010.
Deismireacht MLAUniversity of Cambridge. Cambridge Preliminary English Test With Schools 1 With Answers: Examination Papers From University of Cambridge ESOL Examinations: English for Speakers of Other Languages. New York: Cambridge university press, 2010.