5Paul, J. , J. P. Murdoch. Study Content and Process, Competences upon Graduation and Employment [ A ]. In U. Teichler ( ed. ) Careers of University Graduates : Views and Experiences in Comparative Perspectives [ C ]. Dordrecht: Springer. 2007:41 - 54.
6Brauns, H. , S. Steinmann, A. Kieffer, C. Marry. Does education matter? France and Germany in Comparative Perspec- tive [ J ]. European Sociological Review, 1999 ( 15 ) :61 - 90.
7Spence, M. Job Market Signaling [ J ]. Quarterly Jour- nal of Economies, 1973(87) :355 -74.
8Sorensen, A.B. Toward A Sounder Basis for Class A- nalysis [ J ]. American Journal of Sociology, 2000 ( 105 ) : 1523 - 1558.