Polya, George,  1887-1985 <br/><br/>
How to solve it :  a new aspect of mathematical method / 
G. Polya. 
 - 2nd ed. 
 - Princeton, N.J. :  Princeton University Press,  1957. 
 - xxi, 253 p. :  ill. ;  21 cm. 
<br/><br/> Reprint of the 1945 ed. 
<br/><br/>Bibliographical footnotes. 
<br/><br/><label>ISBN: </label>0691080976 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics--Study and teaching.<br/>Mathematics--Problems, exercises, etc.