Operating systems / 
3G E-Learning 
 - New York :  3G E-Learning LLC,  2020. 
 - xiv, 357 p.: col. ill.; 25.3 cm. 
<br/><br/>Includes index 
<br/><br/><label>ISBN: </label>9781984638489 
<br/><br/><label>Dewey Class. No.: </label>C 005.4 Op615 2020