Azis, Adek Cerah Kurnia, et al. “Digitalisation of Teaching Materials for Toba Batak Ethnic Decorative Variety With Procreate Media Based on P-Books and E-Books”. Jurnal Kependidikan, vol. 9, no. 3, Sept. 2023, pp. 782-93, doi:10.33394/jk.v9i3.8746.