Langan, J. (1988). English skills with readings (3rd ed.). McGraw hill.
芝加哥风格引文Langan, John. English Skills with Readings. 3rd ed. New York: McGraw hill, 1988.
MLA引文Langan, John. English Skills with Readings. 3rd ed. McGraw hill, 1988.
警告：这些引文格式不一定是100％准确.