3Grin,F.The Economics of Language:Survey,Assessment,and Prospects[J].International Journal of the Sociology of Language,1996.
4Vaillancourt,F.Language and Socioeconomic Status in Quebec:Measurement,Findings,Determinants,and Policy Costs[J].International Journal of the Sociology of Language,1996.
5Pool,J.The World Language Problem[J].Rationality and Society,1991,(3).
6Mettewie,L.& L.van Mensel.Multilingualism at All Costs:Language Use and Language Needs in Business in Brussels[J].Sociolinguistica 23:Language Choice in European Companies.2009.
7McManus,W.Labor Market Costs of Language Disparity:An Interpretation of Hispanic Earnings Differences[J].The American Economic Review,1985,(4).
8Grin,F.,Sfreddo,C.& Vaillancourt F."Langues étrangères dans l'activité professionelle" rapport final de recherché[EB/OL].2009/10/12.www.unige.ch/eti/recherches/groupes/elf/recherche-activite/projets-acheves/LEAP/leap_rf_resume.pdf.
9Mankiw,G.Principles of Economics (fifth edition)[M].South-Western College Pub,2009.