World book encyclopedia of science 

 - Chicago:   World book Inc.,  1995 
 - 158p. 
<br/><br/>Vol.4 (The planet earth) <br/>Vol.5 (The Plant world)<br/>Vol.6 (The animal world) 
<br/><br/><label>ISBN: </label>0-7166-3393-0 
<br/><br/><label>Subjects--Topical Terms: </label><br/>World
<br/><br/><label>Subjects--Index Terms: </label>Planet  
<br/><br/><label>Universal Decimal Class. No.: </label>R 5/6(03)  / N5.4