Gardiner, A. <br/><br/>
Discovering mathematics :  the art of investigation / 
A. Gardiner 
 - Oxford :  Clarendon Press,  1987 
 - 206 p. ;  24 cm. 
<br/><br/><label>ISBN: </label>0198532822 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Problem solving<br/>Mathematics--Problems, exercises, etc.