Kiling, Indra Yohanes, Yunita Marcelini Manafe, and Beatriks Novianti Bunga. “Optimisme Disposisional Dan Pengukurannya Pada Orang Usia Lanjut”. Journal of Health and Behavioral Science 1, no. 1 (March 13, 2019): 1~12. Accessed November 22, 2024. https://ejurnal.undana.ac.id/index.php/CJPS/article/view/2079.