Al Hafiz, Nofri Wandi, and Helpi Nopriandi. “Designing Number Learning Applications and Early Childhood Mathematics Calculations”. Sinkron : jurnal dan penelitian teknik informatika 3, no. 2 (March 18, 2019): 212-217. Accessed April 26, 2026. https://jurnal.polgan.ac.id/index.php/sinkron/article/view/10083.