Nurhidayah, N., M. Syamsulhadi, S. Anantanyu, and A. Probandari. “Characteristics of Leisure Participation Amongst Older Adults in Karanganyar Central Java Indonesia”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 39, no. 2, June 2018, pp. 29-39, https://www.gssrr.org/index.php/JournalOfBasicAndApplied/article/view/9038.