Grabowski, Ralph. <br/><br/>
The Illustrated Autocad quick reference for 2013 and beyond / 
Ralph Grabowski. 
 - Clifton Park, NY :  Cengage Learning,  2012. 
 - p. cm. 
<br/><br/><label>ISBN: </label>9781133963875 
<br/><br/><label>LCCN: </label>2012938374