New encyclopaedia Britannica <br/><br/>
Macropaedia : Knowledge in depth, Vol 4 (Ceylon - Congreve); 15th ed. 

 - Chicago  Encyclopaedia Britannica, Inc.  1977 
 - 1132 
<br/><br/><br/>English 
<br/><br/><label>Dewey Class. No.: </label>R032  / E.B