WIDODO, Estu; SUDARSONO, Franciscus Xaverius. Developing an observation instrument for assessing the effectiveness of English teaching at vocational secondary schools. REID (Research and Evaluation in Education), [S. l.], v. 2, n. 2, p. 135–154, 2016. DOI: 10.21831/reid.v2i2.8648. Disponível em: https://journal.uny.ac.id/index.php/reid/article/view/8648. Acesso em: 10 may. 2025.