WORLD WAR I: U.S. MARINES. - 'First in the Fight.' American World War I Marine corps recruiting poster, c1918, by James Montgomery Flagg.. Fine Art.Encyclopædia Britannica ImageQuest. Web. 9 Dec 2015.
Your group needs at least 4 sources.
Two of the sources should be from databases or books. The other two can be any kind of reliable source (websites, videos, interviews).
Each group should create a shared Noodle Tools project to keep your list of works cited.