Diana Fitri Yani, Lantip Diat Prasojo. The Effect of Teacher Certification, Professionalism, and Work Discipline on their Performance in Pekanbaru City Senior High School. IJETR [Internet]. 2025 Mar. 15 [cited 2026 Jun. 14];3(1):55-68. Available from: https://jurnalinternasional.com/index.php/ijetr/article/view/398