Polya . G  <br/><br/>
How to solve it  

 - Anchor :   New york ;  1957. 
 - 253 p; 21 cm .  01 
 - 2025-02-18 
<br/><br/><label>Nat. Bib. No.: </label>0001229 
<br/><br/><label>Nat. Bib. Agency Control No.: </label>POL 
<br/><br/><label>Universal Decimal Class. No.: </label>510