00294nam a2200109Ia 4500008004100000020001800041082001500059100001400074245004600088260004200134300000800176190710s9999    xx            000 0 und d  a81-85475-97-0  a371.331 K5  aKhan, M I 0aInstructional technology media and theory  aDelhibKanishka Publishers Distc1993  a340