BERRY, Roger. The Pedagogic Grammarian’s Dilemma: Modality and Personality in Grammatical Description. Studia Anglica Posnaniensia, [S. l.], v. 45, n. 1, p. 117–135, 2009. DOI: 10.2478/v10121-009-0008-3. Disponível em: https://pressto.amu.edu.pl/index.php/stap/article/view/v10121-009-0008-3. Acesso em: 4 aug. 2026.