1. Bolden , C. 2013 Commercial Crew Development http://blogs.nasa.gov/bolden/2013/04/
2. Canfield , A. 2016 The Evolution of the NASA Commercial Crew Program Mission Assurance Process
3. Committee of Sponsoring Organizations of the Treadway Commission (COSO) 2004 Enterprise Risk Management-Integrated Framework
4. Committee of Sponsoring Organizations of the Treadway Commission (COSO) 2013 Internal Control-Integrated Framework