00325nam a2200121Ia 450000500170000000800410001704100080005808200150006610000270008124500480010826000380015630000090019420260720174536.0260720s2006    xx            000 0 und d  aeng  a374.1 SIDD  aSiddiui, Mujibul Hasan  aDistance learning technologies in education  aNew DelhibA P H Publishingc2006  a207p