Schonell, F. J. <br/><br/>
Backwardness in the basic subjects 

 - 4th ed. 
 - Edinburgh :  Oliver and Boyd,  1948 
 - xix, 566 p. :  ill. , tables 
<br/><br/>Bibliographical footnotes 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Remedial teaching<br/>Exceptional children<br/>Handicapped children