Nelsen, Roger B. <br/><br/>
Proofs without words  Exercises in visual thinking  More exercises in visual thinking 
Roger B. Nelsen 
 -  The Mathematical Association of America Washington, D.C.  1993  c1993 
 - 2v. : ill. ; 26 cm. 
 - Classroom resource materials  no. 1 .
<br/><br/> v.1. - Exercises in visual thinking - v.2. More exercises in visual thinking  v.2. published 2000  Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>9780883857006 v.1. 9780883857212 v.2. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics - Charts, diagrams, etc.--QA
<br/><br/><label>LC Class. No.: </label>QA90.N385 1993