Dinda Shobiyyah, Junierissa Marpaung and Ramdani 2025. THE EFFECTIVENESS OF PROBLEM-SOLVING-BASED INFORMATION SERVICES IN IMPROVING THE HIGH ORDER THINKING SKILLS OF ADOLESCENTS AT TANJUNG GUNDAP. PROCEEDING OF INTERNATIONAL CONFERENCE ON MULTIDISCIPLINARY STUDY. 2, 1 (Jan. 2025), 83–94.