Widodo, Pratomo, Akbar K Setiawan, and Le Hoai An. “COMPETENCIES OF GERMAN LANGUAGE TEACHERS IN INDONESIA AND VIETNAM BASED ON COMMON EUROPEAN FRAMEWORK OF REFERENCE FOR LANGUAGES (CEFR)”. LITERA 15, no. 1 (August 15, 2016). Accessed May 6, 2025. https://journal.uny.ac.id/index.php/litera/article/view/9772.