Nainggolan, Elfrida. “PENERAPAN PENDEKATAN CONCRETE PICTORIAL-ABSTRACT (CPA) UNTUK MENINGKATKAN SIKAP TANGGUNG JAWAB, KEMAMPUAN PENGUASAAN KONSEP, DAN KEMAMPUAN PEMECAHAN MASALAH MATEMATIKA DI SDS XYZ JAKARTA [THE APPLICATION OF THE CONCRETE-PICTORIAL-ABSTRACT (CPA) APPROACH TO IMPROVE RESPONSIBILITY, CONCEPTUAL UNDERSTANDING, AND MATHEMATICAL PROBLEM SOLVING SKILLS AT SDS XYZ JAKARTA]”. JOHME: Journal of Holistic Mathematics Education 6, no. 1 (June 8, 2022): 107–121. Accessed February 23, 2025. http://ojs.uph.edu/index.php/JOHME/article/view/4527.