Adhi, Gigih Rizqi, et al. “118. Improving 10th Grade Students’ Writing Skills through Problem Based Learning and Wepik in SMK 4 Semarang”. Prosiding Seminar Nasional Pendidikan Profesi Guru, vol. 1, no. 1, July 2023, pp. 1080-9, https://conference.upgris.ac.id/index.php/psnppg/article/view/4055.