W. Andrew Hoskins et al. "30 Years of Electric Propulsion Flight Experience at Aerojet Rocketdyne", Paper IEPC-2013-439, 33rd International Electric Propulsion Conference, Washington DC, October 2013. http://www.iepc2013.org/get?id=439 3 Mart 2016 tarihinde Wayback Machine sitesinde arşivlendi.
W. Andrew Hoskins et al. "30 Years of Electric Propulsion Flight Experience at Aerojet Rocketdyne", Paper IEPC-2013-439, 33rd International Electric Propulsion Conference, Washington DC, October 2013. http://www.iepc2013.org/get?id=439 3 Mart 2016 tarihinde Wayback Machine sitesinde arşivlendi.