CAHYANI, S.; PERDANA, S. Textbooks evaluation by Ur’s Theory. Journal of English Language and Pedagogy, [S. l.], v. 2, n. 2, p. 162–171, 2019. DOI: 10.36597/jelp.v2i2.4869. Disponível em: https://jurnal.ustjogja.ac.id/index.php/ELP/article/view/4869. Acesso em: 3 oct. 2023.