Siagian, M.L., Indarwati, R. and Lestari, P. 2020. Non-pharmacological Therapy for the Elderly to Prevent Dementia through Cognitive Stimulation Therapy: A Systematic Review. Jurnal Ners. 15, 1Sp (Jul. 2020), 221–229. DOI:https://doi.org/10.20473/jn.v15i1Sp.19018.