Kiik, S. M., A. R. Vanchapo, M. F. Elfrida, M. S. Nuwa, and S. Sakinah. “Effectiveness of Otago Exercise on Health Status and Risk of Fall Among Elderly With Chronic Illness”. Jurnal Keperawatan Indonesia, vol. 23, no. 1, Mar. 2020, pp. 15-22, doi:10.7454/jki.v23i1.900.