Zebua, Septinus, and Sutikno. “Implementation of Cooperative Learning Model Towards Improving Writing Competence Student Argumentation Discourse Text Class XI State Vocational School 1 Lolofitu West Nias”. International Journal of Educational Research Excellence 4, no. 2 (August 11, 2025): 570–580. Accessed February 10, 2026. https://ejournal.ipinternasional.com/index.php/ijere/article/view/1503.