“Application Of Problem Based Learning Model To Improve Negotiation Text Writing Skills In Class X AKL 1 SMK Negeri 1 Duduksampeyan”. AL-WIJDÃN Journal of Islamic Education Studies, vol. 9, no. 1, Januari 2024, hlm. 82-91, https://doi.org/10.58788/alwijdn.v9i1.3624.