1. E.M. Jones, K. Glover (Eds.), Apollo Lunar Surface Journal, June 25, 2009, Retrieved August 3, 2009, from 〈http://history.nasa.gov/alsj/frame.html〉.
2. NASA Technical Reports Server, July 5, 2007, Retrieved August 3, 2009, from 〈http://ntrs.nasa.gov/search.jsp〉.
3. B. Andrepont, Manned Spaceflight PDF Documents, February 2, 2008, Retrieved August 3, 2009, from 〈http://www.geocities.com/bobandrepont/spacepdf.htm〉, since deleted but cached at the Internet Archive at 〈http://web.archive.org/web/20071014061358/http://www.geocities.com/bobandrepont/spacepdf.htm〉.
4. A. Brown, Apollo Guidance Computer Project Home Page, February 1, 2003, Retrieved August 3, 2009, from History of Recent Science & Technology: 〈http://authors.library.caltech.edu/5456/1/hrst.mit.edu/hrs/apollo/public/index.html〉.
5. R. Burkey, Virtual AGC and AGS Home Page, July 22, 2009, Retrieved August 3, 2009, from 〈http://www.ibiblio.org/apollo/〉.