May, P. (2010). Complete PET Workbook without answers. Cambridge University Press.
Trích dẫn kiểu ChicagoMay, Peter. Complete PET Workbook Without Answers. Cambridge University Press, 2010.
ציטוט MLAMay, Peter. Complete PET Workbook Without Answers. Cambridge University Press, 2010.
אזהרה: ציטוטים אלה לעיתים לא מדויקים ב 100%.