Weber, Robert J. <br/><br/>
Forks, phonographs and hot air ballons :  a field guide to invention / 
Robert J. Weber 
 - New York :  Oxford University Press,  1992 
 - xiv, 277 p. :  ill. ;  24 cm. 
<br/><br/>p. 266-272 
<br/><br/><label>ISBN: </label>019506402X  RM85.07 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Inventions<br/>Creative thinking