5Bonacich E. A theory of middleman minorities [J]. American Sociological Review, 1973,38(5):583 - 594.
6Light I, Gold S J. Ethnic economies [M]. New York: Academic Press, 2000.
7Boyd R L. The organization of an ethnic economy:Urban black communities in the early twentieth century [J]. The Journal of Socio-Economics, 2012(41) : 633 - 641.
8Ward R. Ethnic business and economic change: an overview[J]. International Small Business Journal, 1986,4(3): 10 - 12.
9Boyd R L. Black and Asian self-employment in large metropol- itan areas: a comparative analysis [J]. Social Problems, 1990, 37(2): 258 - 274.
10Bonacich E. A theory of ethnic antagonism: the split labour market EJ]. American Sociological Review, 1972(37): 547- 559.