Britanica :  Global Edition/ 
Hoiberg, Dale .H ; Levy,Michael. - 
 - Chicago:  Encyclopedia Britanica,Inc.,  2011. - 
 - 11541 
<br/><br/> Mendelsohn-Mtshali . - 
<br/><br/><label>ISBN: </label>978-1-62513-418-9 
<br/><br/><label>Dewey Class. No.: </label>032  / H 719