7Robert,M.Student Achievement as A Function of Class Size and Pupil-Teacher Ratio[D].Eastern Michigan University,2006.
8Maxwell,N.& Lopus,J.A Cost Effectiveness Analysis of Large and Small Classes in the University[J].Educational Evaluation and Policy Analysis,1995,17(02).
9Berlin,B.& Cienkus,R.Size:The Ultimate Educational Issue?[J].Education and Urban Society,1989,21(2).
10Bandiera,O.&Valentino.R.Heterogeneous Class Size Effects:New Evidence from a Panel of University Students[C].CEPR Discussion Papers.2009.