Guffey, Mary Ellen  <br/><br/>
Essentials of business communication/ 
Mary Ellen Guffey  
 - 6th ed. 
 - 	Singapore :    Cencage Learning,   c2004. 
 - xix, 560 pages :   black & white, illustrations,  26cm. 
<br/><br/>Includes index. 
<br/><br/><label>ISBN: </label>978-981-4352-66-6. 
<br/><br/><label>Dewey Class. No.: </label>Circ. 808.066 G941e 2004