RIZAL, Muhammad Sulton. The Development of Content-Based English Material for Office Administration Program in Vocational High School. RETAIN : Journal of Research in English Language Teaching, [S. l.], v. 9, n. 2, p. 170–178, 2021. Disponível em: https://ejournal.unesa.ac.id/index.php/retain/article/view/41949. Acesso em: 3 jul. 2025.