Stallings William Ed. <br/><br/>
Data computer communications 

 - 5 
 -  1997 
<br/><br/><label>Standard No.: </label>123620 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>D6,8(B),4, N7