Nafiáh, Ulfatun, Mashuri Mashuri, and Daya Negri Wijaya. 2019. “The Development of Digital Book of European History to Shape the Students’ Democratic Values”. International Journal of Emerging Technologies in Learning (iJET) 14 (06):pp. 147-154. https://doi.org/10.3991/ijet.v14i06.9760.