Fatimah, Nur, and Japen Sarage. “IN-SERVICE TEACHERS’ PROBLEMS IN DEVELOPING ENGLISH TEXTBOOKS FOR ELEMENTARY SCHOOL STUDENTS”. Celtic : A Journal of Culture, English Language Teaching, Literature and Linguistics 11, no. 2 (December 24, 2024): 536–546. Accessed June 4, 2026. https://ejournal.umm.ac.id/index.php/celtic/article/view/35446.