SOURCES:
Brewin, Chris R., and Emily A. Holmes. Psychological Theories of Posttraumatic Stress Disorder. 6 Mar. 2003. PDF.
"Firstworldwar.com." First World War.com. Web. 25 Nov. 2012. <http://firstworldwar.com/>.
Livengood, Shelby. Psychological Trauma: Shell Shock during WWI. Fall 2011. PDF.
"World War 1 Trench Warfare WW1." HubPages. Web. 25 Nov. 2012. <http://jimmythejock.hubpages.com/hub/World_War_1_Trench_Warfare>.
"World War I." History.com. A&E Television Networks. Web. 25 Nov. 2012. <http://www.history.com/topics/world-war-i>.
"Firstworldwar.com." First World War.com. Web. 25 Nov. 2012. <http://firstworldwar.com/>.
Livengood, Shelby. Psychological Trauma: Shell Shock during WWI. Fall 2011. PDF.
"World War 1 Trench Warfare WW1." HubPages. Web. 25 Nov. 2012. <http://jimmythejock.hubpages.com/hub/World_War_1_Trench_Warfare>.
"World War I." History.com. A&E Television Networks. Web. 25 Nov. 2012. <http://www.history.com/topics/world-war-i>.