HUTAGALUNG, R. T.; MUTIARA, R. An Analysis of Negative Politeness Strategies in an English Textbook. EduInovasi:  Journal of Basic Educational Studies, [S. l.], v. 5, n. 3, p. 1450–1469 , 2025. DOI: 10.47467/edu.v5i3.10205. Disponível em: https://journal-laaroiba.com/ojs/index.php/edu/article/view/10205. Acesso em: 31 may. 2026.