Julina, J., N. Ayuningtias, and R. Rudiansyah. “SFE Learning Model for High School Mandarin Teachers in Tebing Tinggi City”. Randwick International of Education and Linguistics Science Journal, Vol. 2, no. 3, Sept. 2021, pp. 467-75, doi:10.47175/rielsj.v2i3.313.