1World Bank. Informal Financial Markets and Financial In- ter-mediation in Four African Countries[J].Findings:Africa Region, 1997.6.10.
2Anders Isaksson. Ihe Importance of Informal Finance in Kenyan Manufacturing[M].SIN Working Paper Series,2002.5.
3Ivan Light,Michelle Pham. Beyond credit worthy:Mi- cro-credit and Informal credit in the United States[J]. Journal of Developmental Entrepreneurship,1998.13.