Dwijayanti, A. A. S. S. ., and I. W. . Wiarta. “Problem Based Learning Using Open Ended Questions Improves Students’ Mathematical Critical Thinking Ability in Elementary Schools”. Thinking Skills and Creativity Journal, vol. 7, no. 1, July 2024, pp. 167-74, doi:10.23887/tscj.v7i1.78033.