1. Can We Get to Mars? (With Cornelius Ryan) Collier’s, Vol. 133, No. 13, April 30, 1954 p. 22–9.
2. Realistic Near-Term Propellant Depots: : Jonathan A. Goff, Bernard F. Kutter, Frank Zegler, Dallas Bienhoff, Frank Chandler, Jeffrey Marchetta. .
3. “Review of US. Human Space Flight Plans Committee, Seeking a human spaceflight program worthy of a great nation”; .
4. McClesky CM. Space Shuttle Operations and Infrastructure - A Systems Analysis of Design Root Causes and Effects, NASA/TP 2005 211519; NASA KSC.
5. http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20100003415_2010003482.pdf.