Application Of Problem Based Learning Model To Improve Negotiation Text Writing Skills In Class X AKL 1 SMK Negeri 1 Duduksampeyan. ALWIJDAN [Internet]. 2024 Jan. 15 [cited 2026 Oct. 3];9(1):82-91. Available from: https://ejournal.uniramalang.ac.id/alwijdan/article/view/3624