Spinardi, Graham.

From Polaris to Trident.

Cambridge, England: Cambridge University Press, 1994.

Spitzer, Cary R., ed.

Viking Orbiter Views of Mars.

NASA SP-441. Washington, D.C.: U.S. Government Printing Office, 1980.

Stares, Paul B.

Space Weapons and US Strategy.

London: Croom Helm, 1985. ---.

Space and National Security.

अज्ञात पृष्ठ