Waruwu, N., Riana, R., Hur, A. K., & Telaumbanua, Y. M. (2024). Learning to Write Argumentation Paragraphs Using the Problem Based Learning (PBL) Model. International Journal of Language and Ubiquitous Learning, 2(2), 208–216. https://doi.org/10.70177/ijlul.v2i2.1129