Benton, Brian C., <br/><br/>
Mastering AutoCAD 2021 and AutoCAD LT 2021 / 
Brian C. Benton and George Omura. 
 - 2nd ed. 
 - Newark :  John Wiley & Sons, Incorporated,  2021. 
 - xxxiii, 1078 pages :  illustrations ; 
<br/><br/><label>ISBN: </label>9781119715351  55.00