The permanent input hypothesis: the case of textbooks and (no) student learning in Sierra Leone (English)
Evans, David K. ; Marshak, Anastasia ; Sabarwal, Shwetlena - 2014 - Anglais
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Many children left behind? Textbooks and test scores in Kenya
Moulin, Sylvie ; Kremer, Michael ; Glewwe, Paul - 2009 - Anglais