Polya, George,  1887-1985. <br/><br/>
Mathematical discovery  on understanding, learning, and teaching problem solving 
George Polya. 
 - Combined ed. 
 - New York  John Wiley & Sons  1981. 
 - xxv, 220 page :  illustrations ;  22cm. 
<br/><br/> First issued in two volumes 
<br/><br/>Bibliography: pages 207-209 
<br/><br/><label>ISBN: </label>0471089753 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics--Problems, exercises, etc.<br/>Problem solving