00506nam a2200157Ia 450000500170000000800410001702000170005804100080007508200150008310000170009824500430011526000460015830000160020465001070022070000210032720191107164041.0190710s9999    xx            000 0 und d  a81-700-042-4  aeng  a371.331 B4  aBhatnagar, S 0aEducation and communication technology  aNew Delhib: Ess Ess Publications, c1988  axxv, 298p.   a| Education - Communication technology a| Educational technologies a| Education - Instruction media   aAnand, Satyapal