Jeff Bezos (@JeffBezos), «Congrats @SpaceX,» Twitter, December 21, 2015, 5:49 p. m., https://twitter.com/JeffBezos/status/679116636310360067.
159
Alexander MacDonald, The Long Space Age: The Economic Origins of Space Exploration from Colonial America to the Cold War (New Haven, CT: Yale University Press, 2017), 135.
