Sites
https://www.britannica.com/topic/League-of-Nations
http://www.historylearningsite.co.uk/modern-world-history-1918-to-1980/league-of-nations/
http://www.history.com/this-day-in-history/league-of-nations-instituted
https://history.state.gov/milestones/1914-1920/league
http://www.worldatwar.net/timeline/other/league18-46.html
http://www.bbc.co.uk/history/worldwars/wwone/league_nations_01.shtml