Langan, J. (1981). English Skills (2nd ed.). McGraw-Hill.
芝加哥风格引文Langan, John. English Skills. 2nd ed. New York: McGraw-Hill, 1981.
MLA引文Langan, John. English Skills. 2nd ed. McGraw-Hill, 1981.
警告：这些引文格式不一定是100％准确.
APA引文
Langan, J. (1981). English Skills (2nd ed.). McGraw-Hill.
芝加哥风格引文Langan, John. English Skills. 2nd ed. New York: McGraw-Hill, 1981.
MLA引文Langan, John. English Skills. 2nd ed. McGraw-Hill, 1981.