Gattegno, Caleb <br/><br/>
The common sense of teaching mathematics / 
by Caleb Gattegno 
 - Educational Solutions :  New York,  1974 
 - ix, 129 p. :  illus. ;  22 cm. 
<br/><br/>Bibliography: p. 129 
<br/><br/><label>ISBN: </label>0878250247 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics--Study and teaching (Elementary)