Spread Your Wings, It's Time to Fly [online]. NASA, 2006-07-26, [cit. 2006-09-21]. Dostupné online.
grc.nasa.gov
International Space Station Nickel-Hydrogen Batteries Approached 3-Year On-Orbit Mark [online]. NASA, [cit. 2007-09-14]. Dostupné online. Archivované 2007-08-15 z originálu.
Ask The Mission Team - Question and Answer Session [online]. NASA, [cit. 2006-09-12]. Dostupné online. Archivované 2013-11-04 z originálu.
International Space Station Nickel-Hydrogen Batteries Approached 3-Year On-Orbit Mark [online]. NASA, [cit. 2007-09-14]. Dostupné online. Archivované 2007-08-15 z originálu.