Williams, Harold M. <br/><br/>
Education of the severaly retarded child :  classroom programs / 
prepared by Harold M. Williams. 
 - Washington :  U. S. Department of Health, Education and Welfare,  1961. 
 - vi, 82 p. :  il. 
<br/><br/><label>Encabezamiento--Tema: </label><br/>EDUCACION ESPECIAL ---PLANES Y PROGRAMAS<br/>NIŅOS CON DISCAPACIDAD MENTAL