"Saturn C-4". Astronautix.com. Archived from the original on 17 June 2012. Retrieved 8 June 2012.
web.archive.org
"Saturn C-4". Astronautix.com. Archived from the original on 17 June 2012. Retrieved 8 June 2012.
"Saturn C-4B". 2012-06-17. Archived from the original on 2012-06-17. Retrieved 2023-12-26.{{cite web}}: CS1 maint: bot: original URL status unknown (link)