Harahap, Nova Jayanti, and Tina Mariany Arifin. “IMPROVING GRADE VIII STUDENTS™ VOCABULARY ACHIEVEMENT THROUGH CONCEPT ATTAINMENT MODEL”. TRANSFORM: Journal of English Language Teaching and Learning 2, no. 2 (November 16, 2025). Accessed September 30, 2026. https://jurnal.unimed.ac.id/2012/index.php/jelt/article/view/911.