SULAIMAN, R.; MANSYUR, U. 21st Century Learning Model Integrated to 6C to Increase Students’ Engagement in English Subject: Lesson Study based Classroom Action Research. Jurnal Sinestesia, [S. l.], v. 13, n. 2, p. 1413–1419, 2023. Disponível em: https://www.sinestesia.pustaka.my.id/journal/article/view/550. Acesso em: 10 oct. 2026.