Ghufron, M.A. and Ermawati, S. 2018. The Framework of Cooperative Problem-based Learning (Co-PBL) to Promote Verbal Creativity in EFL Writing: Is It Feasible?. Jurnal Arbitrer. 5, 2 (Oct. 2018), 81–93. DOI:https://doi.org/10.25077/ar.5.2.81-93.2018.