Phannalath, V. and Prasojo, L.D. 2017. The effectiveness of principal’s competencies implementation at SMAN 3 and Internasional Budi Mulia Dua Yogyakarta. Jurnal Akuntabilitas Manajemen Pendidikan. 5, 2 (Oct. 2017), 220–227. DOI:https://doi.org/10.21831/amp.v5i2.15651.