Shihab, Ahmad Nizar, et al. “Equity in Utilization of Inpatient ForNational Health Insurance (JKN) Program in Indonesia”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 31, no. 2, Jan. 2017, pp. 58-74, https://gssrr.org/JournalOfBasicAndApplied/article/view/6845.