00338nam a2200133Ia 450000500170000000800410001702000180005808200220007610000170009824500270011526000250014230000100016765000270017720250409104117.0231217s9999    xx            000 0 und d  a9788120308107  a370.15  KAK;2  R1  aKakkar, S B. 0aEducational psychology  c1993bPHIaNew delhi  av+193  aEducational,psychology