Zorkoczy, Peter. <br/><br/>
Information technology :  an introduction / 
Peter Zorkoczy and Nicholas Heap. 
 - 4th ed. 
 - London :  Pitman,  1995. 
 - 255 p. :  ill. ;  25 cm. 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>0273605917 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telecommunication.<br/>Data transmission systems.<br/>Computer networks.