Seifert, H. S. (1959). Space technology. John Wiley and Sons, INC.
Lua i Stíl Chicago (17ú heag.)Seifert, Howard S. Space Technology. New York: John Wiley and Sons, INC, 1959.
Lua MLA (9ú heag.)Seifert, Howard S. Space Technology. John Wiley and Sons, INC, 1959.
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