Sources
About.com Inventors. (2014). A Brief History of Writing
Instruments. Retrieved from About.com
Inventors website
inventors.about.com/library/weekly/aa100197.htm
Ancient Civilizations. (2008). 6f. The Fall of the Roman Empire.
Retrieved from Ancient Civilizations
website www.ushistory.org/civ/6f.asp
Middle Ages. (n.d.). Middle Ages Weapons. Retrieved from
Middle Ages website
www.lordsandladies.org/middle-ages-weapons.htm
Middle Ages. (n.d.). Knights Armor. Retrieved from Middle Ages
website
www.lordsandladies.org/knights-armor.htm
About.com Inventors. (2014). The History of the Telephone
Alexander Graham Bell. Retrieved from
About.com Inventors website
inventors.about.com/od/bstartinventors/a/
telephone.htm
The University of Houston’s College of Engineering. (1988-1997).
No. 179: Electric Chair. Retrieved
from The University of Houston’s College of Engineering
website www.uh.edu/engines/epi179.htm