LeVitus, Bob, <br/><br/>
MacOS Catalina for dummies / 
Bob LeVitus, Houston Chronicle "Dr. Mac" columnist.  
 - xiii, 511 pages :  illustrations ;  24 cm.  
 - For dummies  .
 - For dummies .
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>9781119607885 
<br/><br/><label>Subjects--Uniform Titles: </label><br/>Mac OS.
<br/><br/><label>Subjects--Topical Terms: </label><br/>Macintosh (Computer). <br/>Operating systems (Computers).