1. Acton JP (1975) Non-monetary factors in the demand for medical services: some empirical evidences. J Polit Econ 3:595–614
2. Akin J, Griffin C, Guilkey D, Popkin B (1984) Demand for primary health care services in the Bicol region of the Philippines. Econ Dev Cult Change 34:755–782
3. Anderson JG (1968) A behavioral model of families use of health services: Center for health administration studies, University of Chicago
4. Ayonrinde OLF (2002) User Charges, Quality of Services and Utilization of Modern Health Care Facilities in Oyo State. A Ph.D thesis submitted to the Department of Economics, University of Ibadan, Ibadan. Nigeria. February.
5. Bedi AS, Kimalu P, Kimenyi M, Manda D, Mwabu G, Nafula N (2003) User charges and utilization of health services in Kenya. Working Paper Series No. 381. Institute of Social Studies, The Hague, The Netherlands