Sources

Welch, David. Depicting the enemy. British Library, 2014. https://www.bl.uk/world-war-one/articles/depicting-the-enemy.
Fox, Jo. Atrocity Propaganda. British Library, 2014. https://www.bl.uk/world-war-one/articles/atrocity-propaganda
http://www.nationalarchives.gov.uk/pathways/firstworldwar/britain/espionage.htm
The National Archives. Propaganda 1914-1918. http://www.nationalarchives.gov.uk/education/britain1906to1918/g6/background.htm