PERKINS E.A <br/><br/>
Helping the retarded:  a systematic behavioral approach/ 
E.A  Perkins, P.D. Taylor and A.C.M. Capie 
 - Wolverhampton:  Institute of mental:  c 
 - v,105p.:  ill.; 
<br/><br/><label>Dewey Class. No.: </label>157.8