Busnawir, Busnawir, Ika Yuniawati, Mardiati Mardiati, and Ediaman Sitepu. “The Effectiveness of Project-Based Learning in Developing the 21st Century Skills”. Darussalam: Journal of Psychology and Educational 4, no. 1 (June 26, 2025): 35–50. Accessed December 17, 2025. https://www.journal.minangdarussalam.or.id/index.php/djpe/article/view/272.