00289nam a2200109Ia 4500008004100000020001800041082001500059100001800074245004200092260003700134300000800171190710s9999    xx            000 0 und d  a81-7541-092-2  a370.15 Ag3  aAggarwal, J C 0aBasic ideas in educational psychology  aDelhibShipra Publicationsc2003  a254