M. . Oktaviani, K. Dwihapsari, M. N. Islami, N. P. Dewi, R. N. Fadhilah, and Z. D. Palupi, “Cognitive Development of Elementary School Children in Developing Critical Thinking Ability and Understanding Mathematical Concepts”, IETI, vol. 1, no. 2, pp. 134 - 142, Jul. 2023.