Hutagalung, Margaretta Serevina, and Supardi U. S. “ EFFECTIVENESS OF PROBLEM BASED INSTRUCTION (PBI) VS EXPOSITORY MODEL: A COMPARATIVE STUDY OF JUNIOR HIGH SCHOOL STUDENTS’ SPLDV PROBLEM SOLVING ABILITY ”. Academic Journal Research, vol. 3, no. 2, June 2025, pp. 173-7, doi:10.61796/acjoure.v3i2.357.