Martha Yolandia Sinaga. The Influence of Teacher Competency and Student Learning Motivation On The Learning Achievement Of Economics Class X Students Of SMA Negeri 12 Medan In Academic Year 2014/2015. OJE [Internet]. 2023 Aug. 30 [cited 2025 Oct. 12];2(2):58-61. Available from: https://outlinepublisher.com/index.php/OJE/article/view/170