APA引文

HELEN NAYLOR. (1996). Essential grammar in use supplementary exercises (0 521 46997 X). Cambridge.

Trích dẫn kiểu Chicago

HELEN NAYLOR. Essential Grammar in Use Supplementary Exercises (0 521 46997 X). Cambridge, 1996.

MLA引文

HELEN NAYLOR. Essential Grammar in Use Supplementary Exercises (0 521 46997 X). Cambridge, 1996.

警告：这些引文格式不一定是100％准确.