Kassinger Ruth. <br/><br/>
Build a  better mousetrap / 

 -  John  wiley and sons, Inc,  c 2002 
 - ix,112 p, ;  NA  24 cm. 
<br/><br/><label>ISBN: </label>0471395382 
<br/><br/><label>Dewey Class. No.: </label>609.21