ELLYA TAMBUNAN. Pos Bloc Medan: A Sustainable Heritage Tourism Model for North Sumatra. International Journal of Educational Technology Research, [S. l.], v. 2, n. 4, p. 559–580, 2025. DOI: 10.59890/ijetr.v2i4.133. Disponível em: https://jurnalinternasional.com/index.php/ijetr/article/view/133. Acesso em: 9 may. 2026.