Gerardus Rizki Lumbangaol, et al. “Agensi Siswa Dalam Project-Based Learning: Analisis Motivasi Dan Partisipasi Siswa SMPN 7 Pematangsiantar”. Young Journal of Social Sciences and Humanities, vol. 2, no. 1, Jan. 2026, pp. 82-89, https://journal.sufiya.org/index.php/yjssh/article/view/252.