MERRIAM-WEBSTER PUB. (1996). MERRIAM-WEBSTER`S GUIDE TO BUSINESS CORRESPONDENCE (2ND.). MERRIAM-WEBSTER.
芝加哥风格引文MERRIAM-WEBSTER PUB. MERRIAM-WEBSTER`S GUIDE TO BUSINESS CORRESPONDENCE. 2ND. MASSACHUSETTS: MERRIAM-WEBSTER, 1996.
MLA引文MERRIAM-WEBSTER PUB. MERRIAM-WEBSTER`S GUIDE TO BUSINESS CORRESPONDENCE. 2ND. MERRIAM-WEBSTER, 1996.
警告：这些引文格式不一定是100％准确.