Nurmawati, N., I. Ismartoyo, and E. Kurniasih. “DESIGN VIDEO COURSE LEARNING HIGH SCHOOL MATHEMATICS WITH FLIPPED CLASSROOM MODEL FOR IMPROVING STUDENTS’ CRITICAL THINKING ABILITY”. Proceeding International Conference on Digital Education and Social Science, vol. 1, no. 1, Nov. 2022, pp. 257-65, https://prosiding.appipgri.id/index.php/icdess/article/view/35.