REZEKI, Sabrini Mentari. CASE STUDY OF UNDERACHIEVER STUDENTS IN FOUNDATION HIGH SCHOOL OF HARAPAN MANDIRI MEDAN. Psikologi Prima, [S. l.], v. 2, n. 2, p. 129–135, 2020. DOI: 10.34012/psychoprima.v2i2.876. Disponível em: http://139.162.50.187/index.php/Psikologi/article/view/876. Acesso em: 2 apr. 2026.