PERWIRA, Susilo Adi. Textbook Readibility Assessment of K13 English Textbook For Twelfth Grade. IJET (Indonesian Journal of English Teaching), [S. l.], v. 8, n. 2, p. 38–47, 2019. DOI: 10.15642/ijet2.2019.8.2.38-47. Disponível em: https://jurnalftk.uinsa.ac.id/index.php/IJET/article/view/212. Acesso em: 23 feb. 2026.