LUMBAN GAOL, D.; SIANTURI, T. M. . . The Effect of PKN Lessons in Improving the Students Spirit of Nationalism of the National Awakening in1908 of Eight Grade Students SMP Negeri 4 Siborongborong. Jurnal Mantik, [S. l.], v. 5, n. 3, p. 1781-1783, 2021. Disponível em: https://iocscience.org/ejournal/index.php/mantik/article/view/1753. Acesso em: 5 aug. 2026.