Sudarjo, Sudarjo, and Suyitno Suyitno. “Effect Of Student Learning Motivation And Lecturer Competence On Student Achievement In Commerce Correspondence Learning”. International Journal of Educational Research & Social Sciences 4, no. 1 (February 27, 2023): 126–131. Accessed June 14, 2025. https://ijersc.org/index.php/go/article/view/583.