SJAIFULLAH, A. Developing speaking materials for students of Mechanical Engineering at State Polytechnic of Malang. JLT: Jurnal Linguistik Terapan, [S. l.], v. 1, n. 1, p. 10–18, 2011. Disponível em: https://jurnal.polinema.ac.id/index.php/jlt/article/view/270. Acesso em: 29 dec. 2025.