Credits :

You can also find other information on these books.

1. Light and Sound ----- Heinemann Library

2. Sound Waves to Music

3. Sound ----- Neil Ardley

4. The Usborne Book of Science ----- Steve Parker

5.Modern Technical Physics ----- Dr. M.p. Hullins & Jenny Tyler

6. Dictionary of Physics ----- ArtherBeiser

7. Encarta 95 ----- H.J. Gray & Alan Isaacs

8.The new book of knowledge

And this websites:

9.. National Museum of Science& Technology of Canada ----- http://www.science-tech.nmstc.ca