Erwanto, R., & Kurniasih, D. E. (2020). The effectiveness of puzzle therapy on cognitive functions among elderly with dementia at Balai Pelayanan Sosial Tresna Werdha (BPSTW) Yogyakarta, Indonesia. Bali Medical Journal, 9(1), 86–90. https://doi.org/10.15562/bmj.v9i1.1628