Polya, George,  1887-1985. <br/><br/>
Mathematical discovery :  on understanding, learning, and teaching problem solving  / 
George Polya. 
 - New York :  Wiley,  1965. 
 - 2 v. :  ill. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Problem solving.<br/>Mathematics--Problems, exercises, etc.