Books, Time-Life. <br/><br/>
Communications / 
Time-Life Books. 
 - Revised ed. 
 - [S.l.] :  Time Life Medical,  1990. 
 - 128 p. ;  28 cm. 
 - Understanding computers. .
 - Understanding computers. .
<br/><br/><label>ISBN: </label>0809475782 (hardcover) 9780809475780 (hardcover) 
<br/><br/><label>Dewey Class. No.: </label>621.382