http://www.home.zonnet.nl/rene.brouwer/majorbattles.htm
http://mentalfloss.com/article/31882/12-technological-advancements-world-war-i
http://theworldwar.pastperfectonline.com/archive
http://www.firstworldwar.com/origins/causes.htm
http://www.spiegel.de/international/germany/millions-billions-trillions-germany-in-the-era-of-hyperinflation-a-641758.html
http://www.historyrocket.com/World-War/world-war-i/Important-People-In-World-War-One.html
http://www.biography.com/people/alexandra-feodorovna-37295
http://www.bbc.co.uk/schools/worldwarone/hq/causes1_01.shtml
http://www.encyclopedia.com/topic/Triple_Alliance_and_Triple_Entente.aspx
http://mentalfloss.com/article/31882/12-technological-advancements-world-war-i
http://theworldwar.pastperfectonline.com/archive
http://www.firstworldwar.com/origins/causes.htm
http://www.spiegel.de/international/germany/millions-billions-trillions-germany-in-the-era-of-hyperinflation-a-641758.html
http://www.historyrocket.com/World-War/world-war-i/Important-People-In-World-War-One.html
http://www.biography.com/people/alexandra-feodorovna-37295
http://www.bbc.co.uk/schools/worldwarone/hq/causes1_01.shtml
http://www.encyclopedia.com/topic/Triple_Alliance_and_Triple_Entente.aspx