Smart, W. K. a. Business letters.
Chicago Edition CitationSmart, Walter Key..[et al.]. Business Letters.
MLA引文Smart, Walter Key..[et al.]. Business Letters.
警告：這些引文格式不一定是100％准確.
APA引文
Smart, W. K. a. Business letters.
Chicago Edition CitationSmart, Walter Key..[et al.]. Business Letters.
MLA引文Smart, Walter Key..[et al.]. Business Letters.