Encyclopaedia Britannica <br/><br/>
The New  Encyclopaedia Britannica (Vol-18)   :Micropaedia Knowledge In Depth 
/by Encyclopaedia Britannica 
 - 15th ed. 
 - USA,  Encyclopaedia Britannica ;  1978. 
 - 1106p. 
<br/><br/><label>ISBN: </label>0852293305 
<br/><br/><label>Dewey Class. No.: </label>030  / ENC/T