Novita Indrisari Lumban Gaol. “The Implementation of the Problem-Based Learning Model in Teaching National Values”. Jurnal Pendidikan Vokasi Indonesia 1, no. 02 (February 28, 2023): 34–38. Accessed August 25, 2026. https://jurnal.mifandimandiri.com/index.php/jpvi/article/view/125.