May P. Peter & Sayer M. Mike. (2002). Towards proficiency: Workbook with key. New York, Oxford University Press, 2002.
Chicago Style (17. basım) AtıfMay P. Peter ve Sayer M. Mike. Towards Proficiency: Workbook with Key. New York, Oxford University Press, 2002, 2002.
MLA (9th ed.) AtıfMay P. Peter ve Sayer M. Mike. Towards Proficiency: Workbook with Key. New York, Oxford University Press, 2002, 2002.
Uyarı: Bu alıntı herzaman %100 doğru olmayabilir..