SIAGIAN, P. Article of KDBK in English 20 The Advancement of Demographics Learning Tools: The Advancement of Demographics Learning Tools. Advances in Social Sciences Research Journal, [S. l.], v. 7, n. 3, p. 279–295, 2020. DOI: 10.14738/assrj.73.7936. Disponível em: https://journals.scholarpublishing.org/index.php/ASSRJ/article/view/7936. Acesso em: 28 may. 2022.