Encyclopaedia Britannica,  . <br/><br/>
Britannica Book of the the Year /  

 - 1st ed /  
 - Chicago :   Encyclopaedia Britannica, Inc.. 
 - p.990 :  
<br/><br/><label>ISBN: </label>0-85229-428-X 
<br/><br/><label>Dewey Class. No.: </label>N56,N85  / M5