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3. Bray, Mark. 2011. The Challenge of Shadow Education: Private Tutoring and its Implications for Policymakers in the European Union. Brussels, Belgium: European Commission.
4. Benefits and Tensions of Shadow Education: Comparative Perspectives on the Roles and Impact of Private Supplementary Tutoring in the Lives of Hong Kong Students
5. Bray, Mark. 2021. Shadow Education in Africa: Private Supplementary Tutoring and its Policy Implications. Hong Kong: Comparative Education Research Centre, The University of Hong Kong, UNESCO.