References
Office of Statistics, Unesco. At the first level, enrolments have increased by 83 per cent, second level by 140 per cent and third level by over 200 per cent (world averages).
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Spaulding, S. Advanced educational technologies. Prospects in Education 1, 9–19 (1970). https://doi.org/10.1007/BF02354404
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DOI: https://doi.org/10.1007/BF02354404