1. Committee on the Peaceful Uses of Outer Space, United Nations General Assembly, A/AC.105/663, 13 December 1996, source: 〈http://www.oosa.unvienna.org/Reports/AC105_663E.pdf〉.
2. A. Ellery, An Introduction to Space Robotics, Springer–Praxis Books in Astronomy and Space Sciences, Praxis Publishers Ltd., Chichester, UK, 2000, p. 57.
3. Johnson Space Flight Center, NASA, Spacecraft/Vehicle Level Cost Model, source: 〈http://www.jsc.nasa.gov/bu2/SVLCM.html〉.
4. W. Larson, J. Wertz, Space Mission Analysis and Design, Kluwer Academic Publishers, Boston, MA, 1999, p. 804.
5. Futron Corporation, 2001–2002 Satellite Industry Indicators Survey, source: 〈http://www.sia.org/papers/〉.