Frederick T.T.N (2026) “Influence of Water Source and Electrolyte pH on Hydrogen Production Efficiency in Laboratory-Scale PEM Electrolysis”, International Journal of Integrated Engineering, 18(7), pp. 108–122. Available at: https://journal.uthm.edu.my/index.php/ijie/article/view/26162 (Accessed: 8 November 2026).