Purwandari, E. P., E. W. Winarni, K. Junus, and S. Soraya. “An Adaptive Learning System Integrated With Fuzzy Logic to Improve Higher-Order Thinking Skills”. Engineering, Technology & Applied Science Research, vol. 15, no. 5, Oct. 2025, pp. 28150-6, doi:10.48084/etasr.12751.