Sukur, Silvester Goridus. “VOCABULARY AS PART OF LINGUISTIC COMPETENCE IN SMA ENGLISH TEXTBOOKS IN INDONESIA”. Academic Journal Perspective : Education, Language, and Literature 8, no. 1 (May 27, 2020): 39–49. Accessed July 25, 2025. https://jurnal.ugj.ac.id/index.php/Perspective/article/view/3350.