Labib, Radimas Putra Muhammad Davi, et al. “Low Cost System for Face Mask Detection Based Haar Cascade Classifier Method”. MATRIK : Jurnal Manajemen, Teknik Informatika Dan Rekayasa Komputer, vol. 21, no. 1, Nov. 2021, pp. 21-30, https://doi.org/10.30812/matrik.v21i1.1187.