อรุณศรีมรกต ส. (2018) “ISO 50001:2001 (ENERGY MANAGEMENT SYSTEMS)”, Research Journal Phranakhon Rajabhat : Science and Technology, 13(2), pp. 197–206. available at: https://li01.tci-thaijo.org/index.php/PRRJ_Scitech/article/view/119064 (accessed: 10 September 2026).