1. Acharya, S., Ghimire, S., Jeffers, E. M., & Shrestha, N. (2019). Health care utilization and health care expenditure of Nepali older adults. Frontiers in Public Health, 7(24), 1–10.
2. Aday, L. A., & Andersen, R. M. (1974). A framework for the study of access to medical care. Health Services Research, 9, 208–220.
3. Adetsav, A. O. S. (2016). Out-of-pocket expenditures, equity in equity in maternal health care utilization and health outcomes in Nigeria. Dissertation. Kenya: Kenyatta University.
4. Adisa, O. O. (2016). The determinants and consequences of economic vulnerability among urban elderly Nigerians. Dissertation. United Kingdom: University of Nottingham..
5. Adisa, O. (2015). Investigating determinants of catastrophic health spending among poorly insured elderly households in urban Nigeria. International Journal for Equity in Health, 14(79), 1–11.