Rosida Tiurma Manurung, Abdul Rahmat. EFFECTIVENESS AND EFFICIENCY TEACHING AND LEARNING PROCESSWITH COURSE LEARNING SYSTEM. Elementary Education Online [Internet]. 2023 Dec. 19 [cited 2024 Jun. 2];20(4):1141-6. Available from: https://ilkogretim-online.org/index.php/pub/article/view/5117