Shiellany, Salsabila, and Budi Poniam. “An Analysis of Place Value Content in the Curriculum 2013 Thematic Textbooks for Grades 1 and 2”. Jurnal Riset Pendidikan Matematika 7, no. 1 (May 13, 2020): 88–96. Accessed May 18, 2025. https://journal.uny.ac.id/index.php/jrpm/article/view/33184.