8Southgate Darby: Determinants of Shadow education: A Cross-- National Analysis ,Dissertation of the Degree Doctor in the Ohio State University ,2009. 被引量：1
9The Challenge of Shadow Education: Private Tutoring and Its Implication for Policy Makers in the Eu- ropean Union[EB/OL]. http://www, nesse, fr/nesse/activities/ reports/activities/ reports, pdf, 2011 -- 06-- 06/2011-- 12-- 11. 被引量：1
