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*[http://www.space.com/businesstechnology/technology/050503_cev_nasa.html NASA Receives Crew Exploration Vehicle Proposals] News article by Leonard David, Space.com
*[http://www.thenewatlantis.com/archive/8/zubrinprint.htm Getting Space Exploration Right - view on spiral development]
*[http://web.archive.org/web/20060927210019/http://www.planetary.org/programs/projects/aim_for_mars/study-report.pdf Extending Human Presence Into the Solar System] (PDF)
*[http://www.spaceref.com/news/viewnews.html?id=1055 NASA's New CEV Launcher to Maximize Use of Space Shuttle Components]
*[http://www.spaceref.com/news/viewnews.html?id=1048 NASA and White House Discuss Early Shuttle Fleet Retirement]
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