BRANIGAN, Laura Adhi Pramadhika. Teachers’ Roles in Applying Problem Solving Activity to Teach Speaking. RETAIN : Journal of Research in English Language Teaching, [S. l.], v. 10, n. 01, p. 53–57, 2022. Disponível em: https://ejournal.unesa.ac.id/index.php/retain/article/view/41536. Acesso em: 18 dec. 2025.