SIREGAR, Nurhanna Sari. IMPROVING STUDENTS™ ACHIEVEMENT IN WRITING NARRATIVE TEXT THROUGH PROBLEM BASED LEARNING. TRANSFORM : Journal of English Language Teaching and Learning, North Sumatera, Indonesia, v. 2, n. 1, 2013. DOI: 10.24114/tj.v2i1.902. Disponível em: https://jurnal.unimed.ac.id/2012/index.php/jelt/article/view/902. Acesso em: 16 jul. 2025.