OECD Centre for Effective Learning Environments. (2009). CELE exchange. Organisation for Economic Co-Operation and Development.
Παραπομπή σε μορφή Chicago (17η εκδ.)OECD Centre for Effective Learning Environments. CELE Exchange. Paris: Organisation for Economic Co-Operation and Development, 2009.
Παραπομπή σε μορφή MLA (9th εκδ.)OECD Centre for Effective Learning Environments. CELE Exchange. Organisation for Economic Co-Operation and Development, 2009.
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