Tsaaniyatush Shoolihah Fauzan. “Development of Critical Thinking Skills Through Problem-Based Learning Methods in Ushul Fiqh Subject at Madrasah Aliyah Negeri 2 Yogyakarta”. Al-Ard: Journal of Education, vol. 1, no. 3, Aug. 2025, pp. 79-84, doi:10.63738/al-ard.v1i3.14.