Langan, J. (2006). English skills (5th ed.). McGraw-Hill.
芝加哥风格引文Langan, John. English Skills. 5th ed. New York: McGraw-Hill, 2006.
MLA引文Langan, John. English Skills. 5th ed. McGraw-Hill, 2006.
警告：这些引文格式不一定是100％准确.
APA引文
Langan, J. (2006). English skills (5th ed.). McGraw-Hill.
芝加哥风格引文Langan, John. English Skills. 5th ed. New York: McGraw-Hill, 2006.
MLA引文Langan, John. English Skills. 5th ed. McGraw-Hill, 2006.