Saining, M., R. Rusmayadi, M. A. Musi, and A. Halik. “The Effect of Problem-Based Learning Model on the Ability to Recognize Geometric Shapes in Children Aged 5-6 Years”. Pancasila International Journal of Applied Social Science, vol. 3, no. 01, Jan. 2025, pp. 129-40, doi:10.59653/pancasila.v3i01.1384.