- http://history1900s.about.com/od/worldwari/a/Trenches-In-World-War-I.htm
- http://www.history.com/this-day-in-history/us-enters-world-war-i
- http://www.independent.ie/life/world-war-1/a-history-of-world-war-one-in-10-deadly-weapons-30249206.html
- http://www.history.com/topics/world-war-i
- http://www.tenfactsabout.co.uk/0002armistice.htm
- https://sites.google.com/site/alwwipropaganda/facts
- http://www.bbc.co.uk/schools/gcsebitesize/history/mwh/ir1/schlieffenplanrev3.shtml