Hoffmann, P. (2001). Tomorrow's energy: Hydrogen, fuel cells, and the prospects for a cleaner planet. MIT Press.
Lua i Stíl Chicago (17ú heag.)Hoffmann, Peter. Tomorrow's Energy: Hydrogen, Fuel Cells, and the Prospects for a Cleaner Planet. Cambridge, MA: MIT Press, 2001.
Lua MLA (9ú heag.)Hoffmann, Peter. Tomorrow's Energy: Hydrogen, Fuel Cells, and the Prospects for a Cleaner Planet. MIT Press, 2001.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.