Alfi Andriani, Eli Trisnowati. Integrating Problem-Based Learning and the Teaching at the Right Level Approach to Improve Students’ Collaboration Skills. Int. J. educ. Teach. Zone [Internet]. 2025 Oct. 7 [cited 2026 Apr. 17];4(3):406-22. Available from: https://jurnal.yayasannurulyakin.sch.id/index.php/ijetz/article/view/515