Polya, George,  1887- <br/><br/>
How to solve it :  a new aspect of mathematical method / 
G. Polya. 
 - 2nd ed. 
 - Printice Hall :  University Press,  1971. 
 - xxi,253 p. :  illus. ;  21 cm. 
 - Princeton paperbacks ;  246 .
<br/><br/>Includes bibliographical references. 
<br/><br/> Open access. 
<br/><br/><label>ISBN: </label>
<br/><br/><label>LCCN: </label>79160544  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics--Study and teaching.<br/>Mathematics--Problems, exercises, etc.