Guffey, Mary Ellen. <br/><br/>
Mary Ellen Guffey's essentials of business communication / 
 Essentials of business communication 
Mary Ellen Guffey ; Carolyn M. Seefer, contributing editor. 
 - 7th ed. 
 - Mason, OH :  Thomson/South-Western,  c2007. 
 - 1 v. (various pagings) :  ill. (some col.) ;  28 cm.