1. The demand for health care and health insurance;Besley,1991
2. Evaluation methods for non-experimental data;Blundell;Fiscal Studies,2000
3. Carrin, G., Hollmeyer, H., Jones, J., Everard, M., Ron, A., Savioli, L., & Sen-Hai, Yu. (1999). School health insurance as a vehicle for health-promoting schools: Recent experience in Vietnam. WHO/HSD/HID.99.1. Geneva: World Health.
4. Carrin, G., Sergent, F., & Murray, M. (1993). Towards a framework for health insurance development in Hai Phong. Technical paper 12-WHO/ICO/MESD.12. Geneva: World Health Organisation.
5. The analysis of household surveys;Deaton,1997