Puspitasari, D., and L. . Laoli. “Teaching Numbers Using Teaching Aids to Improve Cognitive and Positive Emotion in The Classroom”. International Journal of Emerging Issues in Early Childhood Education, vol. 5, no. 1, May 2023, pp. 1-9, https://jurnal-fkip.ut.ac.id/index.php/ijeiece/article/view/1594.