00553nam a2200217Ia 4500 0 0 0 0 RIEBPL RIEBPL 2019-07-10 0 46118 2019-07-10 00:00:00 2019-07-10 BK 17120 17120 20191015160250.0 190710s9999 xx 000 0 und d eng 371.331 SA47I Sampath, K Introducation to educational technology 2nd New Delhi :Sterling publishers, 1987 viii,282p. Educational teacnology Communicalion Interaction Teaching aids Teaching mechines BK