Marpaung, Fernando De Napoli, Supriadi, and Resti Citra Dewi. “LEARNING TREE DIAGRAMS IN SYNTAX: STUDENTS’ DIFFICULTIES AND LEARNING STRATEGIES”. JEE (Journal of English Education) 12, no. 1 (June 11, 2026): 224–241. Accessed June 16, 2026. https://journal.upp.ac.id/index.php/JEE/article/view/4538.