Proyek Vanguard: Perbedaan antara revisi
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== Pranala luar ==
* [http://www.hq.nasa.gov/office/pao/History/SP-4202/cover.htm ''Vanguard - A History'' (NASA SP-4202, 1970) online book] {{Webarchive|url=https://web.archive.org/web/20181007015322/https://www.hq.nasa.gov/office/pao/History/SP-4202/cover.htm |date=2018-10-07 }}
* [http://history.nasa.gov/series95.html NASA History Series Publications] (many of which are on-line)
* [http://www.pbs.org/wgbh/nova/sputnik/nation.html ''NOVA - Sputnik Declassified - PBS.org'']
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