Nelsen, Roger B  . <br/><br/>
Proofs without words: exercises in visual thinking /  
by Roger B. Nelsen. 
 - USA :   The Mathematical Association of America ,   1993 
 - 152p ;  
<br/><br/><label>ISBN: </label>0-88385-700-6 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics
<br/><br/><label>Dewey Class. No.: </label>B  / P0.1