JOHN SEKAR. To Flip or Not to Flip the English Classroom. Journal of English Language Teaching, Chennai, India, v. 59, n. 3, p. 3–10, 2017. DOI: 10.66121/bkk4v227. Disponível em: https://journals.eltai.in/jelt/article/view/JELT590302. Acesso em: 20 feb. 2026.