Barnes, G. A. (1994). English communication skills for professionals. National Textbook.
芝加哥风格引文Barnes, Gregory Allen. English Communication Skills for Professionals. Lincolnwood, IL: National Textbook, 1994.
MLA引文Barnes, Gregory Allen. English Communication Skills for Professionals. National Textbook, 1994.
警告：这些引文格式不一定是100％准确.