1. http://www.merriam-webster.com/dictionary/plastic
. Accessed 23 Jan 2011
2. http://www.americanchemistry.com/2009-year-in-review
3. http://www.americanchemistry.com/production-and-sales-data-by-resin-2009-vs-2008
4. Sperling LH (2001) Introduction to polymer science, 3rd edn. Wiley, New York, p 2
5. Rudin A (1999) The elements of polymer science and engineering, 2nd edn. Academic, San Diego, pp 132–141