Elhefnawy, mohamed. <br/><br/>
communication (1) / 
mohamed Elhefnawy. 
 - cairo :  october 6 University,  [2015]. 
 - 132 p :  ill ;  30 cm. 
<br/><br/> كليه الهندسة 2015. 
<br/><br/><label>Dewey Class. No.: </label>004.6  / m c