REFERENCE

            References

http://www.bl.uk/world-war-one/articles/europe-before-1914

http://www.diercke.com/kartenansicht.xtp?artId=978-3-14-100790-9&seite=36&id=17469&kartennr=1

http://www.history.com/topics/otto-von-bismarck

 http://alphahistory.com/worldwar1/alliances/

http://www.encyclopedia.com/topic/Triple_Alliance_and_Triple_Entente.aspx

http://www.history.com/topics/world-war-i/outbreak-of-world-war-i

http://americanhistory.about.com/od/worldwari/tp/causes-of-world-war-1.htm

http://www.historyhome.co.uk/europe/causeww1.htm

http://www.historytoday.com/annika-mombauer/july-crisis

http://alphahistory.com/worldwar1/july-crisis/

http://global.britannica.com/event/World-War-I

http://www.historyonthenet.com/ww1/ww1_timeline.htm

http://global.britannica.com/topic/trench-warfare

http://history1900s.about.com/od/worldwari/a/Trenches-In-World-War-I.htm

http://www.firstworldwar.com/features/trenchlife.htm

http://www.historylearningsite.co.uk/world-war-one/aerial-warfare-and-world-war-one/aircraft-and-world-war-one/

http://mentalfloss.com/article/31882/12-technological-advancements-world-war-i

http://www.historylearningsite.co.uk/world-war-one/americas-military-power-in-world-war-one/

http://spartacus-educational.com/FWWusa.htm

http://www.history.com/topics/russian-revolution

http://global.britannica.com/event/Russian-Revolution-of-1917

http://www.firstworldwar.com/battles/jutland.htm

http://www.history.com/topics/world-war-i/battle-of-jutland

http://www.historylearningsite.co.uk/world-war-one/naval-warfare-and-world-war-one/the-battle-of-jutland/

http://www.wereldoorlog1418.nl/battleverdun/

http://www.firstworldwar.com/battles/verdun.htm

http://www.firstworldwar.com/battles/somme.htm

http://www.history.com/topics/world-war-i/battle-of-the-somme