Berkeley, Calif. : North Atlantic Books, c1986.

Internet Archive >> None

Greeley, Ronald

New York : Chapman & Hall, 1994.

Internet Archive >> None

Lewis, Richard S., 1916-

New York : Quadrangle, c1976.

Internet Archive >> None

Butrica, Andrew J.

Washington, D.C. : National Aeronautics and Space Administration, NASA History Office : For sale by the U.S. G.P.O., Supt. of Docs., 1996.

Internet Archive >> None

Pyne, Stephen J., 1949-

New York : Viking, 2010.

Internet Archive >> None