NAPITUPULU, K. .; MUNTHE, B.; SIREGAR, N. The Effect of Reinforcement Skills on Increasing the Learning Motivation of Grade XI Students in Christian Religious Education . PIJAR: Jurnal Pendidikan dan Pengajaran , [S. l.], v. 4, n. 1, p. 68–79, 2025. DOI: 10.58540/pijar.v4i1.1124. Disponível em: https://putrapublisher.org/ojs/index.php/pijar/article/view/1124. Acesso em: 17 apr. 2026.