Kaddoura, Sam <br/><br/>
Echo Made Easy / 
Sam Kaddoura 
 - 3rd Edition. 
 - Edinburgh :  Elsevier,  2016. 
 - 286p.  ill;  20cm 
<br/><br/><label>ISBN: </label>9780702066566 
<br/><br/><label>Dewey Class. No.: </label>616.12  / KAD