1. [Bidang DIKBUD KBRI Tokyo]. Undang-Undang Republik Indonesia Nomor 20 tahun 2003 Tentang Sistem Pendidikan Nasional. Indonesia; 2003.
2. Musyaddad K. Problematika Pendidikan di Indonesia [Education Problems in Indonesia]. 2013;4. Available from: http://sim.ormawa.uns.ac.id
3. [United Nations population estimates and projections]. World Population by Country. 2021.
4. Sutama. Metode penelitian pendidikan kuantitatif, kualitatif, P.T.K., R & D [Quantitative, qualitative, educational research methods, PTK, R & D]. Surakarta: Fairuz Media; 2012.
5. Oecd. PISA for Development Assessment and Analytical Framework Reading, Mathematics, and Science PISA Preliminary Version [Internet]. 2017. Available from: www.oecd.org/about/publishing/corrigenda.htm.