References
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- Campeau , P. L. 1974 . “Selective Review of the Results of Research on the Use of Audio Visual Media to Teach Adults,” . A. V. Communication Review , 22 ( 1 )
- Sayer , S. 1973 . “Directions in Educational Technology,” . Programmed Learning and Educational Technology , 10 : 130 – 135 .
- Somerville , M. and Palmer , R. 1947 . School Broadcasting in Britain , B.B.C .
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