Jencks, Stanley M <br/><br/>
Building mental imagery in mathematics 
[by] Stanley M. Jencks [and] Donald M. Peck. 
 - New York  Holt, Rinehart and Winston  [1968] 
 - 115 p.  illus.  28 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics--Study and teaching (Elementary)<br/>Fractions.--Study and teaching.