About --- Citations and References

Permissions
1. All the images are from the site from NASA's website http://www.nasa.gov, the page http://www.nasa.gov/gallery/photo/guildline.html states that we can use the NASA imagery for educational and informational purposes.

References

Electronic Sources --- Text or Multimedia from Web Pages, FTP sites, Telnet
1. How Rocket Engines Work - http://www.howstuffworks.com/rocket.htm
2. How Space Shuttles Work - http://www.howstuffworks.com/space-shuttle.htm
3. How a Space Station Works - http://www.howstuffworks.com/space-station.htm
4. How Spacesuits Work - http://www.howstuffworks.com/space-suit.htm
5. Discovery Centre How It Works: The Space Suit - http://www.uk.utc.com/utc_uk/discover/hiw-emu.htm
6. CNN Space: Interactive Space Suit - http://www.cnn.com/interactive/space/9907/spacesuit/frameset.exclude.html
7. How Weightlessness Works - http://www.howstuffworks.com/weightlessness.htm
8. How Air-breathing Rockets Will Work - http://www.howstuffworks.com/air-breathing-rocket.htm
9. How Space Elevators Will Work - http:f//www.howstufworks.com/space-elevator.htm
10. NASA's Flight Projects Directorate at MSFC - http://flightprojects.msfc.nasa.gov/fd02_elev.html
11. Space Towers - http://liftoff.msfc.nasa.gov/academy/TETHER/spacetowers.html
12. How Space Planes Will Work - http://www.howstuffworks.com/space-plane.htm
13. Marshall Space Flight Center - http://www1.msfc.nasa.gov/NEWMSFC/xplanes.html

Printed Materials

Part of a book
1. Steve Gorton "Space Exploration" Dorling Kindersley Limited, London, 1997, pp.56-57
2. Andy Li, Gordon Lam, Peter Sun "Mastering Physics" Aristo, Hong Kong, 1998

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