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. Outline Journal of Education, [S. l.], v. 2, n. 2, p. 58–61, 2023. DOI: 10.61730/oje.v2i2.170. Disponível em: https://journal.outlinepublisher.com/index.php/OJE/article/view/170. Acesso em: 9 sep. 2025.