Sitorus, S. H., S. N. Y. Wastuti, and S. Astuti. “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, vol. 5, no. 2, May 2025, pp. 233-8, doi:10.58432/algebra.v5i2.1268.