Elfenbein, J. (1973). Business letters and communication. Alexander hamilton Inc.
芝加哥风格引文Elfenbein, Julien. Business Letters and Communication. New York: Alexander hamilton Inc, 1973.
MLA引文Elfenbein, Julien. Business Letters and Communication. Alexander hamilton Inc, 1973.
警告：这些引文格式不一定是100％准确.