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Journal of Youth and Adolescence > 2009 > 38 > 6 > 765-776
European Journal of Psychology of Education > 2007 > 22 > 4 > 421-437
Journal of Youth and Adolescence > 2009 > 38 > 6 > 765-776
European Journal of Psychology of Education > 2007 > 22 > 4 > 421-437