KUSUMA, I. P. I.; MAHAYANTI, N. W. S.; ADNYANI, L. D. S.; BUDIARTA, L. G. R. Incorporating E-portfolio with flipped classrooms: An in-depth analysis of students’ speaking performance and learning engagement. The JALT CALL Journal, Melbourne, Australia, v. 17, n. 2, p. 93–111, 2021. DOI: 10.29140/jaltcall.v17n2.378. Disponível em: https://www.castledown.com/journals/jaltcall/article/view/jaltcall.v17n2.378. Acesso em: 26 sep. 2026.