1. Creating the Twentieth Century
2. 2Anderson,J.D.,ModernCompressibleFlow,withHistoricalPerspective,3rded.,McGraw-Hill,NewYork,2003.
3. 3NASAGoddardSpaceFlightCenter,RobertGoddardandHisRockets,URL:http://www-istp.gsfc.nasa.gov/stargaze/ Sgoddard.htm[cited 3June2013].
4. 5McConnaughey, P. K., Femminineo, M. G., Koelfgen, S. J., Lepsch, R. A., Ryan, R. M., and Taylor, S. A. "Launch Propulsion Systems Roadmap: Technology Area 01," National Aeronautics and Space Administration, URL: http://www.nasa.gov/pdf/500393main_TA01-ID_rev6-NRC-wTASR.pdf[cited5 June2013].