O'Connor, Neil <br/><br/>
Speech and thought in severe subnormality:  an experimental study/ 
N. O'connor and Beate Hermelin 
 - Oxford  Pergamon Press  1962 
 - 122 p. :   ill. ;   22 cm. 
<br/><br/>Includes bibliography. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mentally handicapped children