Designing a Math Picture Book to Stimulate Primary School Students’ Understanding of Properties of 2-D Shapes. J. Teach. Learn. Elem. Educ. [Internet]. 2021 Aug. 17 [cited 2025 Sep. 15];4(2):164-79. Available from: https://jtlee.ejournal.unri.ac.id/index.php/JTLEE/article/view/161