1. Fuel Cell Vehicle World Survey 2003, Breakthrough Technologies Institute, US Department of Energy, Energy Efficiency and Renewable Energy, Feburary 2004.
2. ECTOS information, http://www.newenergy.is/.
3. STEP information, http://www.dpi.wa.gov.au/fuelcells/.
4. CUTE Hydrogen Supply Infrastructure and Fuel Cell Bus Technology, Brochure, EvoBus, 2004.
5. CUTE information, http://www.fuel-cell-bus-club.com/.