The New Encyclopaedia Britannica :  Vol.23 Macropedia. Knowledge in Depth 

 - 15th ed. 
 - Chicago :  Encyclopaedia Britannica, Inc,  1998 
 - 928 p. 
<br/><br/><label>Subjects--Index Terms: </label>Bách khoa thư 
<br/><br/><label>Dewey Class. No.: </label>030  / NEW(23) 1998