Lubis, H. F., and M. Olivia. “Analysis of Soft Tissue Facial Profiles of Chinese Students at W.R. Supratman 1 and 2 High Schools in Medan Using Linear and Angular Measurements”. Dental Journal, vol. 54, no. 3, Aug. 2021, pp. 132-6, doi:10.20473/j.djmkg.v54.i3.p132-136.