Judd, R Stephen. <br/><br/>
Teaching by projection / 
R Stephen Judd. 
 - London :  Focal Press ,  1963. 
 - 172 p. :  ill. ;  19 cm. 
<br/><br/> Includes indexes. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Teaching--Aids and devices.