ALLEN, W. S. (1974). Living english structure: Key to the exercises. Longman.
芝加哥风格引文ALLEN, W. Stannard. Living English Structure: Key to the Exercises. London: Longman, 1974.
MLA引文ALLEN, W. Stannard. Living English Structure: Key to the Exercises. Longman, 1974.
警告：这些引文格式不一定是100％准确.