Ainun Nirwanto, Ahmad, and Edy Winarno. “CALCULATION OF FACE AMOUNT BASED ON FACE DETECTION SYSTEM USING VIOLA JONES METHOD”. Information Technology and Telematics 8, no. 2 (July 20, 2019). Accessed August 6, 2020. https://unisbank.ac.id/ojs/index.php/fti3/article/view/6579.