Kaddoura,Sam <br/><br/>
Echo Made easy 

 - 3rd ed 
 - Edinburgh  Elservier  2016 
 - xiii,286p  ill 
<br/><br/><label>ISBN: </label>9780702066573 
<br/><br/><label>LC Class. No.: </label>MED RC683.5.45  / K26