Sitanggang , Diana Parasian, et al. “The Effect of Providing Reinforcement on Students’ Learning Motivation in Christian Religious Education Subjects Class IX of Talitakum Medan Private Junior High School”. Innovative: Journal Of Social Science Research, vol. 3, no. 4, Sept. 2023, pp. 9884-99, https://j-innovative.org/index.php/Innovative/article/view/4748.