Muchamad Subali Noto, Nurul Ikhsan Karimah, Surya Amami Pramuditya, and Yeni Anggraeni. “Digital 3D Book and Ausubel Theory: Increasing the Mathematical Understanding in a Linear System With Two Variable”. Elementary Education Online 19, no. 4 (December 21, 2023): 1864–1874. Accessed July 29, 2025. https://ilkogretim-online.org/index.php/pub/article/view/6885.