BANINDRA YUDHA, C.; NURMULIA DINIARTI; SATRIA INDRA KUSUMA. EFFORTS TO INCREASE STUDENTS SELF-EFFICACY IN MATHEMATIC SUBJECT WITH FLAT SHAPE MATERIAL THROUGH A PROBLEM BASED LEARNING MODEL. JOURNAL OF HUMANITIES AND SOCIAL STUDIES, [S. l.], v. 1, n. 03, p. 920–927, 2023. Disponível em: https://humasjournal.my.id/index.php/HJ/article/view/169. Acesso em: 3 aug. 2025.