[ch02bib01] Paul, Ceruzzi, Beyond the Limits—Flight Enters the Computer Age, Cambridge, MA, MIT Press,1989

[ch02bib02] Gladwyn, Hill, “For Want of Hyphen Venus Rocket is Lost,” New York Times, July 28, 1962.

[ch02bib03] Oran W. Nicks,, Far Travelers—The Exploring Machines, NASA publication SP-480, 1985.

[ch02bib04] “Venus Shot Fails as Rocket Strays,” Associated Press, New York Times, July 23, 1962.