Encyclopaedia Britannica <br/><br/>
The Encyclopaedia Britannica ; Macropaedia; Knowledge in depth (Volume 14- Peking Probability) 
/by Encyclopaedia Britannica 
 - 15th edition 
 - USA,  Encyclopaedia Britannica ;  1977. 
 - 1110p. 
<br/><br/><label>ISBN: </label>0852293151 
<br/><br/><label>Dewey Class. No.: </label>030  / ENC/T