SHARP, D. W. (1984). Writing business letters with a personal touch. Lifetime Learning Pub.
芝加哥风格引文SHARP, Deborah W. Writing Business Letters with a Personal Touch. Belmont: Lifetime Learning Pub, 1984.
MLA引文SHARP, Deborah W. Writing Business Letters with a Personal Touch. Lifetime Learning Pub, 1984.
警告：这些引文格式不一定是100％准确.