Putri G, Damri D, Iswari M, Kusumastuti G, Tsaputra A. Improving the Ability to Write Natural Number Symbols (1-9) Through the Finger Numbers Media Board for Down Syndrome Students. edumaspul [Internet]. 1Mar.2024 [cited 20May2024];8(1):403-7. Available from: https://ummaspul.e-journal.id/maspuljr/article/view/7649