1. Barry T.1995.NIST Special Publication 811: Guide for the Use of the International System of Units (SI).National Institute of Standards and Technology (NIST) Gaithersburg Md. Available athttp://physics.nist.gov/Pubs/pdf.html.
2. Crowell B.2006.Light and Matter: Newtonian Physics. Edition 2.3 Fullerton Calif. Available athttp://www.lightandmatter.com/area1book1.html
3. http://www.dartmouth.edu/~chemlab/