5Diagne A, Zeller M, Sharma M. Empirical Measurements of Households'Access to Credit and Credit Constraints in Developing Countries: Methodological Issues and Evidence[ C]. FCND Discussion Paper, 2000:90.
6Foltz J. Credit Market Access and Profitability in Tunisian Agriculture [ J ]. Agricultural Economics, 2004, 30 (3) ~ 229 -240.
7Fred D Levy. Apex Institutions in Microfinance [ R ]. CGAP Occasional Paper, 2002:6.
8Stiglitz J E, Weiss A. Credit Rationing in Markets with Imperfect Information [ J ]. American Economic Review, 1981, 71(3) : 393-410.
9Gonzalez-Vega, Claudio. Microfinance Apex Mecha- nisms: Review of the Evidence and Policy Recommenda- tions [ C ]. Rural Finance Program, Ohio State Universi- ty, 1998.