Roddy D, <br/><br/>
Electronic Communications   Textual Documents 

 - 4 th ed . 
 - New Delhi  Dorling Kindersley (India) Pvt.Ltd. Licensees of Pearson Education  2011 
 - 723:  xi;  23*17. 
<br/><br/><label>ISBN: </label>9788177585582   
<br/><br/><label>Dewey Class. No.: </label>621.382  / ROD/COO