Others & Mission Design Documents
Shuttle C
Magnum Launch Vehicle Scroll up or down for details.
While we're at it
Mars Direct
NASA Mars Reference Mission V1 1993: Short Document
NASA Mars Reference Mission V1 1993 Mission: TOC
NASA Mars Reference Mission V1 1993: Mission Summary
NASA Mars Reference Mission V2 1997
NASA Mars Reference Mission V3 1998
You'll see a lot of work has already been done for what is needed to return to the Moon or on to Mars. Merely returning should not cost as much as Apollo. A colony on the other hand is an ISS++ cost task.
Regards,
Mark