HUBBARD, H. An Introduction to Functional Grammar, by M. A. K. Halliday. English Usage in Southern Africa, [S. l.], v. 20, n. 2, p. 69–73, 1989. Disponível em: https://unisapressjournals.co.za/index.php/EUSA/article/view/5144. Acesso em: 3 jul. 2024.