1) http://www.engr.uvic.ca/~sventure/project_book97/97_Project.14.book.html

2) http://www.aquaholic.com/gasses/laws.htm

3) http://www.aquaholic.com/gasses/archem.htm

4) http://www.scubacentral.com/about/learn_to_dive2.html

5) http://www.aquaholic.com/gasses/boyle1.htm

6) http://www.bellsnwhistles.com/lbg/lbg054.html

7) http://www.ender-design.com/rg/images/back/back07c.html

8) http://www.ender-design.com/rg/images/back/back02a.html

9) Mr. Harlan.