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S AK, Suwarti S, Wulandari DA, Sugiyanto ED. PENGEMBANGAN GRATITUDE SKILL TRAINING UNTUK MENINGKATKAN KESEHATAN MENTAL LANSIA: PRELIMINARY STUDY . CDJ [Internet]. 2024 Aug. 14 [cited 2026 Apr. 1];5(4):7675-82. Available from: https://journal.universitaspahlawan.ac.id/index.php/cdj/article/view/33209