7Barham, B. L; Boucher, S. and Carter, M. R.: Credit Constraints, Credit Unions and Small-scale Producers in Guatemala, Worm Development, Vol.24 (5), pp. 793-806, 1996.
8Foltz, J. D.: Credit Market Access and Profitability in Tunisian Agriculture, Agricultural Economics, Vol.30, pp.229-240, 20134.
9Lokshin, M. and Sajaia, Z.: Maximum Likelihood Estimation of Endogenous Switching Regression Models, The Stata Journal, Vol.4 (3), pp.282-289, 2004.
10Maddala, G S.: Limited Dependent and Qualitative Variables in Econometrics, Cambridge University Press, Cambridge, 1983.