The Use of Formal and Informal Language Varieties in Internal Communication of the Deli Serdang Regency DPRD. West Science Social and Humanities Studies , [S. l.], v. 4, n. 05, p. 576–583, 2026. DOI: 10.58812/wsshs.v4i05.2843. Disponível em: https://wsj.westsciences.com/index.php/wsshs/article/view/2843. Acesso em: 31 may. 2026.