Stephen Robert Twigge: The Early Development of Guided Weapons in the United Kingdom, 1940-1960, ISBN 3718652978, Seite 201 [1]
Kevin Madders: A New Force at a New Frontier: Europe's Development in the Space Field in the Light of Its Main Actors, Policies, Law and Activities from Its Beginnings Up to the Present, Verlag Cambridge University Press, 2006, ISBN 0521030226, Seite 26 [2]
