The Grolier Science Encyclopedia  Volume 7 Forces and Movements 

 - Kingfisher Books Plc. ,London  Kingfisher Book Plc.  2000 
 - 336 
<br/><br/><label>ISBN: </label>0753405660 
<br/><br/><label>Dewey Class. No.: </label>R503G892000 V.7