Tobing, Novelina, en Cathryne Berliana Nainggolan. ‘Penerapan Model Pembelajaran Berbasis Proyek Dalam Meningkatkan Motivasi Belajar Siswa Di Kelas VIII [The Implementation of the Project-Based Learning to Improve the Grade VIII Students’ Learning Motivation]’. Diligentia: Journal of Theology and Christian Education 2, no. 2 (mei 31, 2020): 82–100. Geraadpleegd november 20, 2025. https://ojs.uph.edu/index.php/DIL/article/view/2216.