8Baker, D. P. , & Le Tendre, G. K. (2005). National differences, global similarities: World culture and the future of schooling. Stanford: Stanford University Press, 54-70.
9Bray, M. (2006). Private supplementary tutoring: Comparative perspectives on patterns and implications. Compare, 36( 4) , 515-530.
10Stevenson, D. 1. , & Baker, D. P. (1992). Shadow education and allocation in formal schooling: Transition to university in Japan. American Journal of Sociology, 97 ( 6 ) , 1639-1657.