Zulfina, Uun. “Meningkatkan Kebahagiaan Lansia Di Panti Wreda Melalui Psikoterapi Positif Dalam Kelompok”. Psychological Journal: Science and Practice 2, no. 3 (March 12, 2016): 256–267. Accessed June 4, 2026. https://ejournal.umm.ac.id/index.php/pjsp/article/view/2889.