00305nam a2200121Ia 450000500170000000800410001704100080005808200150006610000180008124500370009926000380013630000090017420260720174636.0260720s2006    xx            000 0 und d  aeng  a370.1 AGGT  aAggarwal, J C  aTheory & principles of education  aNew DelhibVikas Publishingc2006  a461p