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1por Tsang, Mun C.“…: Unesco, International Institute for Educational Planning,…”
Publicado 1994
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2por Kemmerer, Frances“…UNESCO, International Institute for Educational Planning,…”
Publicado 1994
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3por Hallak, Jacques“…Unesco, International Institute for Educational Planning ; Pergamon Press,…”
Publicado 1990
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4Publicado 1989“…: Unesco, Institut international de planification de l'education,…”
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