6Carl Diehl.Innocents Abroad:American Students in German Universities,1810-1870 [J]. History of Education Quarterly,1976 16 (3):321-341.
7The American Council on Education(ACE).Students on the Move:The Future of International Students in the United States,Issue Brief October 2006 [DB/OL]. (2010-09-15).http://wwcw.acenet.edu/AM/ Templa te.cfm?Section=Whats_Hot& Template=/CM/ContentDisplay. cfm&+Contentl D= 18564.
8National Science Foundation,Division of Science Resources Statisties,Seientists and Engineers Statistical Data System (SESTAT) (2003)[DB/OL].(2010-09-15).http://sestat.nsf.gov.
9American Mathematical Society.2009 Annual Survey of the Mathematical Sciences (Second Report)[J].Notices of the AMS, 2010,57(7).
10NSF/NIH/USED/USDA/NEH/NASA.2008 Survey of Earned Doctorates [DB/OL]. (2010-09-04).http://www.nsf.gov/statisties/nsf 10309/pdf/tab 11 .pdf.
