Lumban Gaol, Dinata, and Torus M. Sianturi. 2021. “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 5 (3):1781-83. https://www.iocscience.org/ejournal/index.php/mantik/article/view/1753.