5OECD. Education at a Glance 2007:OECD Indicators [ R ]. Paris: OECD, 2007. 303,304,318-319.
6Sajitha Bashir. Trends in International Trade in Higher Education:Implications and Options for Developing Countries [R]. The World Bank,2007. 14,18,20, 20.
10Committee on Policy Implications of Intemational Graduate Students and Postdoctoral Scholars in the United States,Board on Higher Education and Workforce,National Research Council. Policy Implications of International Graduate Students and Postdoctoral Scholars in the United States [M]. Paris:OECD, 2005. 2-12.