1. Asteroid Mining 101;John,2015
2. Pathways to Exploration Rationales and Approaches for a U.S. Program of Human Space Exploration;Academies,2014
3. Human Missions to Mars;Rapp,2007
4. Deep Space Transport ( DST ) and Mars Mission Architecture;Connolly,2017
5. Concept for a Crewed Lunar Lander Operating from the Lunar Orbiting Platform-Gateway Timothy Cichan;Cichan,2018