Voisinet, Donald D.. <br/><br/>
Intriduction to Computer-Aided Drafting /  

 - Second Ed. /  
 - New York :   Gregg Division McGraw-Hill Book Company ,   1987 
 - p274 :  
<br/><br/><label>ISBN: </label>0-07-Y66611-3 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Computer Science
<br/><br/><label>Dewey Class. No.: </label>Bv33:6  / M6