“INCREASING STUDENTS’ ENGAGEMENT AND ACADEMIC ACHIEVEMENT THROUGH THE INTEGRATION OF PROBLEM-BASED LEARNING AND DIFFERENTIATED INSTRUCTION MODELS AT SMA NEGERI 6 KABUPATEN LAMPUNG TIMUR”. 2025. JETA (Journal of English Teaching and Applied Linguistic) 6 (1): 1-9. https://jurnal.stkippgribl.ac.id/index.php/jeta/article/view/1923.