Farol, H. F. (1987). A manual of effective business correspondence. University Book Supply, Inc.
芝加哥风格引文Farol, Honesto F. A Manual of Effective Business Correspondence. Manila: University Book Supply, Inc, 1987.
MLA引文Farol, Honesto F. A Manual of Effective Business Correspondence. University Book Supply, Inc, 1987.
警告：这些引文格式不一定是100％准确.