1. International Energy Agency (IEA), “The future of hydrogen: seizing today’s opportunities”, IEA, 2019. Retrieved from https://www.iea.org/reports/the-future-of-hydrogen.
2. International Renewable Energy Agency (IRENA), “Hydrogen from renewable power: technology outlook for the energy transition”, IRENA, 2018. Retrieved from https://www.irena.org/publications/2018/Sep/Hydrogen-from-renewable-power.
3. Analysis of Domestic and Foreign Policy and Technology Trends for Hydrogen Industry Development
4. Hydrogen Policy Trends and Current Status of Hydrogen Technology Development by Value Chain
5. DNV GL, “Energy transition outlook 2020”, DNV GL, 2020. Retrieved from https://www.dnv.co.kr/article/energy-transition-outlook-2020-download-185170/.