Essentials of business communication / 
Guffey, Mary Ellen ; Almonte Richard . 
 - 6th ed 
 - Toronto :  Nelson Education ,  2010. 
 - xix,529 p,: 
<br/><br/><label>ISBN: </label>9780176473358 
<br/><br/><label>LC Class. No.: </label>HF5718  / .G84  2010