Butterfield, J. (2010). Verbal communication. Course Technology, Cengage Learning.
芝加哥风格引文Butterfield, Jeff. Verbal Communication. Australia: Course Technology, Cengage Learning, 2010.
MLA引文Butterfield, Jeff. Verbal Communication. Course Technology, Cengage Learning, 2010.
警告：这些引文格式不一定是100％准确.