00310nam a2200121Ia 450000500170000000800410001704100080005808200160006610000170008224500400009926000400013930000090017920260720174748.0260720s2007    xx            000 0 und d  aeng  a370.15 AGGE  aAggarwal J C  aEssential of educational psychology  aDelhibVikas Publishing Housec2007  a596p