Perlombaan Antariksa: Perbedaan antara revisi

* [http://catalog.core.nasa.gov/core.nsf/0/a53411230b7e8caa86256b5a005cf758?OpenDocument ''Arrows to the Moon'' synopsis] {{Webarchive|url=https://web.archive.org/web/20060110100140/http://catalog.core.nasa.gov/core.nsf/0/a53411230b7e8caa86256b5a005cf758?OpenDocument |date=2006-01-10 }} from the [[NASA]] website

* [http://www.hq.nasa.gov/office/pao/History/satcomhistory.html Communications Satellites] {{Webarchive|url=https://web.archive.org/web/20150512124220/http://www.hq.nasa.gov/office/pao/History/satcomhistory.html |date=2015-05-12 }} from the NASA website

* [http://www.hq.nasa.gov/office/pao/History/Apollomon/apollo3.pdf Scan of a letter from Wernher Von Braun to Vice President Johnson] {{Webarchive|url=https://web.archive.org/web/20050513043040/http://www.hq.nasa.gov/office/pao/History/Apollomon/apollo3.pdf |date=2005-05-13 }}, dated [[29 April]] [[1961]], providing Von Braun's personal (not professional) assessment of United States and Soviet capability. The analysis includes the opinion that the U.S. has "an excellent chance" of beating the Russians to a manned lunar landing, adding "with an all-out crash program I think we could accomplish this objective in 1967/68."