Text books
Book - Gardner, Robert, 1990. Famous Experiments You Can Do. New York, NY: Franklin Watts (pp. 103–104).Internet
Internet -Blauch, D., 2004. "Gas Laws: Pressure", Department of Chemistry, Davidson College [accessed January 23, 2006]
http://www.chm.davidson.edu/ChemistryApplets/GasLaws/Pressure.htmlJava apps/apps
University of Colorado, B. (n.d.). Masses & Springs. Retrieved from PhET Interactive Simulations:https://phet.colorado.edu/en/simulation/mass-spring-labA
Videos