-"UNODA - 1925 Geneva Protocol." UN News Center. UN, n.d. Web. 06 Apr. 2016.

-"When Chemicals Became Weapons of War." 100 Years of Chemical Weapons. N.p., 09 Feb. 2015. Web. 06 Apr. 2016.

-"Chemical Weapons in World War I." - Wikipedia, the Free Encyclopedia. N.p., n.d. Web. 06 Apr. 2016.

SOURCES