Encyclopaedia britannica 

 - Chicago  William benton pub. London       1973 
 - 1160p  cm. 
 -  V21 .
<br/><br/><label>Standard No.: </label>7,096 
<br/><br/><label>Source: </label> Reference Collections 
<br/><br/><label>Dewey Class. No.: </label>33;L68, J5;L3.21