Elvinawanty R, Martin C, Kumala LV, Khe RE, Patricia A. Optimistic Thinking Training on Enhancement of Self-esteem in Street Children in the Komunitas Peduli Anak (KOPA) Medan. jpbs [Internet]. 2022 Jan. 23 [cited 2026 Mar. 2];2(1):17-23. Available from: https://al-kindipublishers.org/index.php/jpbs/article/view/2773