PANGGABEAN, Christina I.T. FUNCTIONAL GRAMMAR (An Introduction to Metafunctional Components of Language). OKARA: Jurnal Bahasa dan Sastra, [S. l.], v. 5, n. 1, 2011. DOI: 10.19105/ojbs.v5i1.500. Disponível em: https://ejournal.uinmadura.ac.id/index.php/okara/article/view/500. Acesso em: 5 sep. 2026.