Basuki, Hyan, Joni Haryanto, and Tiyas Kusumaningrum. “The Effect of Elderly Cognitive Care on the Cognitive Function and Physical Activity of Elderly”. Indonesian Journal of Health Research 1, no. 2 (December 28, 2018): 37-48. Accessed May 23, 2022. https://e-journal.stikesjembrana.ac.id/index.php/IJHR/article/view/16.