Langan, J. (2003). Sentence skills: A workbook for writers : form A (7th ed.). McGraw-Hill.
芝加哥风格引文Langan, John. Sentence Skills: A Workbook for Writers : Form A. 7th ed. Boston: McGraw-Hill, 2003.
MLA引文Langan, John. Sentence Skills: A Workbook for Writers : Form A. 7th ed. McGraw-Hill, 2003.
警告：这些引文格式不一定是100％准确.