H. CADIAO PHILIPPINES, Esperval Cezhar; B. TAN, Ma. Joji. Effectiveness of Using a Flipped Classroom in Improving English Grammar Proficiency. International Journal of Sciences: Basic and Applied Research (IJSBAR), Jordan, v. 51, n. 2, p. 45–57, 2020. Disponível em: https://www.gssrr.org/JournalOfBasicAndApplied/article/view/10943. Acesso em: 12 sep. 2025.