00317nam a2200109Ia 4500008004100000040003800041100001400079245003800093260005000131300001100181653001500192211215s9999    xx            000 0 und d  cJayakar Knowledge Resource Centre  aWall, W D 0aPsychological service for schools  bUNESCO institute for educationaHamburgc1956  a143 p.  aPsychology