Ningsih, Widia. “NEED ANALYSIS OF CASE-BASED (CREATIVE, ACTIVE, SYSTEMATIC, EFFECTIVE) TEACHING MATERIALS TO IMPROVE STUDENTS’ PROBLEM SOLVING AND CREATIVE THINKING ABILITY”. Jurnal Pelita Pendidikan 12, no. 3 (September 9, 2024): 096–104. Diakses Juli 6, 2025. https://jurnal.unimed.ac.id/2012/index.php/pelita/article/view/66835.