Elisabeth Christina Tumanggor, Lindawati Simorangkir and Amnita Ginting (trans.) (2022) “The Relationship between Self-Efficacy and Positive Thinking Ability in Adolescents at Karya Bhakti Middle School, Tarastar District, Humbang Hasundutan Regency, 2021”, Jurnal Indah Sains dan Klinis, 3(2), pp. 50–56. doi:10.52622/jisk.v3i2.61.