HELEN NAYLOR. (1996). Essential grammar in use supplementary exercises (0 521 46997 X). Cambridge.
Trích dẫn kiểu ChicagoHELEN NAYLOR. Essential Grammar in Use Supplementary Exercises (0 521 46997 X). Cambridge, 1996.
ציטוט MLAHELEN NAYLOR. Essential Grammar in Use Supplementary Exercises (0 521 46997 X). Cambridge, 1996.
אזהרה: ציטוטים אלה לעיתים לא מדויקים ב 100%.