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2. Pyro Universe. History of Fireworks. [Online] Available from: http://www.pyrouniverse.com/history.htm [accessed 6 November 2014].
3. List Dose. Top 10 Disadvantages of Burning Firecrackers. [Online] Available from: http://listdose.com/top-10-disadvantages-of-burning-firecrackers/ [accessed 8 November 2014].
4. Crescent Public Schools. The Chemistry of Black Powder. [Online] Available from: http://crescentok.com/staff/jaskew/TAH/projects/chemistry/HSchem.htm [accessed 8 November 2014].
5. Big Bay Boom. Major Economic Benefits From Firework Show. [Online] Available from: http://www.bigbayboom.com/donate/home-page-under-slider/ [accessed 8 November 2014].
6. About Education. Elements in Fireworks. [Online] Available from: http://chemistry.about.com/od/fireworkspyrotechnics/a/fireworkelement.htm [accessed 11 November 2014].