Wijayanti, Windi, Devanto Shasta Pratomo, and Mohamad Khusaini. “The Effects of Socio-Economic Factors on Health of Elderly in East Java”. Scientific Annals of Economics and Business 65, no. 2 (June 29, 2018): 205–213. Accessed January 17, 2022. http://saeb.feaa.uaic.ro/index.php/saeb/article/view/1091.