FREEMAN, L. ROGER. <br/><br/>
PARACTICAL DATA COMMUNICATIONS / 
ROGER L. FREEMAN. 
 - 2nd ED. 
 - CANADA ;  JOHN WILEY SON  1995. 
 - 825 P. ; 
<br/><br/><label>ISBN: </label>
<br/><br/><label>Dewey Class. No.: </label>004.6  / ROG