Shay, William A. <br/><br/>
Understanding data communications and networks 
William A. Shay; William A. Shay. 
 - 2nd  ed. 
 - Albany  Brooks Press  [n.d.] 
 - xx, 711p.: ill.; 24cm 
 - (Books/Cole Thomson Learning). .
<br/><br/><label>ISBN: </label>0-534-95054-x. 
<br/><br/><label>Dewey Class. No.: </label>004.65  / S35U