SITORUS, S. H.; WASTUTI, S. N. Y.; ASTUTI, S. COUNSELLING ACTION RESEARCH (PTBK): IMPROVING SOCIAL RELATIONSHIPS THROUGH CLASSICAL SERVICES WITH A PROBLEM-BASED LEARNING APPROACH FOR STUDENTS IN CLASS XI F3. Algebra : Jurnal Pendidikan, Sosial dan Sains, [S. l.], v. 5, n. 2, p. 233–238, 2025. DOI: 10.58432/algebra.v5i2.1268. Disponível em: https://ejournal.yana.or.id/index.php/algebra/article/view/1268. Acesso em: 15 apr. 2026.