CHHAYPOR, Ing. The application of the principles of effective schooling inSMP PIRI Ngaglik Sleman Yogyakarta Special Province. JOURNAL OF EDUCATION, [S. l.], v. 3, n. 01, 2011. Disponível em: https://jurnal.uny.ac.id/index.php/joe/article/view/490. Acesso em: 14 may. 2025.