Ali, Sri Widyarti. “Syntactic Tree Diagram: Students’ Problems and the Causes”. International Journal of English Linguistics, Literature, and Education (IJELLE) 5, no. 1 (July 12, 2023): 68–76. Accessed July 3, 2024. https://journal.univetbantara.ac.id/index.php/ijelle/article/view/3717.