Kurniawati, D., E. Yusmita, and E. Nasra. “Enrichment of Material and Training for Solving Chemistry Olympiad Questions for Teachers at SMAN 1 Ampek Angkek”. Pelita Eksakta, Vol. 4, no. 2, Nov. 2021, pp. 101-3, doi:10.24036/pelitaeksakta/vol4-iss2/149.