Siagian, M. L., R. Indarwati, and P. Lestari. “Non-Pharmacological Therapy for the Elderly to Prevent Dementia through Cognitive Stimulation Therapy: A Systematic Review”. Jurnal Ners, vol. 15, no. 1Sp, July 2020, pp. 221-9, doi:10.20473/jn.v15i1Sp.19018.