Encyclopaedia Britannica <br/><br/>
Humans 

 - U.S.A.  Publications International, Ltd.  2010 
 - 80 
<br/><br/><label>ISBN: </label>978-1-60553-908-9 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Encyclopaedia <br/>Facts<br/>Humans<br/>Juvenile Non-Fiction