1. "ExplorationSystemsArchitectureStudyFinalReport,"NASA TM-2005-214062,November 2005.
2. "Crew Exploration Vehicle System Requirements Document," NASA CEV Document Number: CxP72000,January2007.
3. "Crew Exploration Vehicle Architecture Design Document," NASA CEV Document Number: CxP-72140, January2007.
4. "Constellation Program Design Specification for Natural Environments (DSNE)," NASA Document Number:CxP-70023,January2007.
5. "Constellation Program Human-Systems Integration Requirements (HSIR)," NASA Document Number: CxP-70024,January2007.