Style guide for business and technical communication / 
Covey , Franklin  
 - 3rd ed. 
 - USA:  Franklin covey ,  1999. 
 - viii,440 p,: 
<br/><br/><label>ISBN: </label>1883219825 
<br/><br/><label>LC Class. No.: </label>HF5718  / .C68  1999