Wahyuningrum, E., Sudirman, S., Rodriguez Nieto, C., Hidayat, R., Isnawan, M., Yumiati, Y. and Susandi, A. 2026. Transforming Geometric Thinking Through a Flipped Semi-Concrete Model: A Van Hiele and Cognitive Load Theory Perspective in Coastal Elementary Education. Journal of Curriculum Studies Research. 8, 2 (Jul. 2026), 187-218. DOI:https://doi.org/10.46303/jcsr.2026.30.