Utari, S. “Improving the Learning Outcomes of History of Pre-Literacy Life Materials in Indonesia Through the "Grace Door" Quiz for Students of Class X IPS 1 SMA N 1 Banjarnegara”. Indonesian Journal of History Education, Vol. 6, no. 2, Sept. 2021, pp. 173-84, doi:10.15294/ijhe.v6i2.27642.