ETHERTON, A. Contact 2: A secondary english course.-- rev. edition. Longman.
芝加哥风格引文ETHERTON, A.R.B. Contact 2: A Secondary English Course.-- Rev. Edition. London: Longman.
MLA引文ETHERTON, A.R.B. Contact 2: A Secondary English Course.-- Rev. Edition. Longman.
警告：这些引文格式不一定是100％准确.