Guffey, Mary Ellen. , <br/><br/>
Essentials of business communication  

 - 6th ed. 
 - USA:  Academic Internet Publishers,  2007. 
 - xxxii, 511 p.:  ill. (some col.) ;  28 cm. 
<br/><br/> Includes bibliographical references (p. 501-504) and index.  
<br/><br/><label>ISBN: </label>9781428808393 
<br/><br/><label>Dewey Class. No.: </label>808.06651 GUF