1. Mars Surveyor Program,1997
2. NASA Policy Directive;Biological Contamination Control for Outbound and Inbound Planetary Spacecraft,1995
3. NASA Policy Guide;Planetary Protection Provisions for Robotic Extraterrestrial Missions,1996
4. NASA Handbook;NASA Standard Procedures for the Microbiological Examination of Space Hardware,1980
5. Space Studies Board,1992