D. B. B. Butar, N. Erizon, A. Karudin, and P. Primawati, “The freedom to learn-independent campus curriculum for shielded metal arc welding: A teaching module development”, JPTK, vol. 7, no. 4, pp. 245–256, Nov. 2024, doi: 10.24036/jptk.v7i4.40223.