OLIVIA ANGELINA PAKPAHAN, RUTH. Improving Speaking Skill of Tourism Vocational High School Students Through Project Based Learning. RETAIN : Journal of Research in English Language Teaching, [S. l.], v. 6, n. 2, 2018. Disponível em: https://ejournal.unesa.ac.id/index.php/retain/article/view/24822. Acesso em: 29 nov. 2025.