Zorkoczy, Peter <br/><br/>
Information technology : an introduction 
Peter Zorkoczy 
 - 4th ed. 
 - London  Pitman Publishing  1990. 
 - xiii, 255p. :.  ill.  25cm 
<br/><br/> Include index.:p.251-255 
<br/><br/><label>ISBN: </label>0273605917 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Computer networks<br/>Data transmission systems<br/>Electronic mail systems<br/>Information technology