00297nam a2200121Ia 450000500170000000800410001704100080005808200170006610000180008324500270010126000380012830000090016620260720174551.0260720s2004    xx            000 0 und d  aeng  a371.333 VENE  aVenkataiah, S  aEducational technology  aNew DelhibA P H Publishingc2004  a234p