Подробности спутниковых программ см.: ODER F. C.E., FITZPATRICK J. C, WORTHMAN P. E. The Gambit Story. Chantilly, Va.: Center for the Study of National Reconnaissance, 2012, и CHESTER R. J. A History of the Hexagon Program: The Perkin-Elmer Involvement. Chantilly, Va.: Center for the Study of National Reconnaissance, 2012. Также: TURNER ST. Burn Before Reading: Presidents, CIA Directors, and Secret Intelligence. New York: Hyperion, 2005. P 161.