Sumaidi, Sumaidi, et al. “Peningkatan Hasil Belajar Peserta Didik Melalui Kombinasi Problem Based Learning-Case Study Di SMK Negeri 6 Surakarta”. Jurnal Pendidikan Tambusai, vol. 9, no. 2, May 2025, pp. 13298-05, https://jptam.org/index.php/jptam/article/view/26994.