Nasution, Roimarthen Saoutra, et al. “Implementation of Problem Based Learning Model to Improve Student Learning Outcomes in Islamic Education Learning at State Vocational School 3 Sibolga”. Journal of Indonesian Primary School, vol. 1, no. 4, Dec. 2024, pp. 65-71, https://journal.mgedukasia.or.id/index.php/jips/article/view/363.