<ul>
<li>Roger          D. Launius - <em>Nasa</em><a href="http://www.hq.nasa.gov/office/pao/History/Apollomon/cover.html" target="_blank"> Apollo:          A Retrospective Analysis, Washington, DC 1994</a></li>
<li>Selby          Cull - <em>Journal of Young Investigators</em><a href="http://www.jyi.org/volumes/volume10/issue1/features/cull.html" target="_blank"> Giant          Leap for Mankind or Giant Leap of Faith?</a></li>
<li>W.          David Compton - <em>Nasa</em><a href="http://www.hq.nasa.gov/office/pao/History/SP-4214/contents.html" target="_blank"> Where          No Man Has Gone Before: A History of Apollo Lunar Exploration Missions</a></li>
<li>Autori          vari - <em>Nasa </em><a href="http://www.hq.nasa.gov/office/pao/History/" target="_blank">History          Division</a></li>
</ul>