R. Sri Aulia, D. Stivani Suherman, A. Asrizal, and F. Ulfa Jhora, “Needs Analysis for Developing PBL-Based E-Modules on Alternative Energy to Improve High School Students’ Critical Thinking Ability”, Department of Physics Universitas Negeri Padang, vol. 4, no. 1, pp. 77–83, Apr. 2026.