[2016-08-29]. (原始内容存档于2018-07-06). Hydrogen/Natural Gas (HCNG) Fuel Blends. Office of Energy Efficiency and Renewable Energy (EERE). 2009-10-07 [2010-07-11]
1007/BF02396837. Amos, Wade A. Costs of Storing and Transporting Hydrogen (PDF). National Renewable Energy Laboratory: 6–9. 1998-11-01 [2015-05-19]. (原始内容存档