Impact :  a Guide to business communication / 
Northey, Margot ; McKibbin Joan  
 - 8th ed. 
 - Toronto:  Pearson Canada ,  2011. 
 - x,246 p,: 
<br/><br/><label>ISBN: </label>9780132158862 
<br/><br/><label>LC Class. No.: </label>HF5718  / .N67  2011