Sistem perhubungan 

 - 33 pages :   illustrations ;   33 cm 
 - Siri minda .
 - Siri minda .
<br/><br/><label>ISBN: </label>9830750833 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Communication
<br/><br/><label>Dewey Class. No.: </label>621.38