Encyclopaedia Britannica <br/><br/>
Encyclopaedia Britannica;1981 Britannica Book of the Year  
/by Encyclopaedia Britannica 
 - Chicago,  Encyclopaedia Britannica ;  1981. 
 - 786p. 
<br/><br/><label>ISBN: </label>085229381X 
<br/><br/><label>Dewey Class. No.: </label>031  / ENC/E