Encyclopaedia britannica 

 - Chicago  William benton London        1973 
 - 979p  cm. 
<br/><br/><label>Standard No.: </label>7,160 
<br/><br/><label>Source: </label> Reference Collections 
<br/><br/><label>Dewey Class. No.: </label>33:L68, L5;L3.4