The Treaty of Versailles in the mind of the Germans stabbed them in the back, especially the guilt clause that made them take blame for the First World War. Hitler capaitalized on these sentiments and used them to rally the German people.
Secondary Sources are materials that digest, analyze, evaluate and interpret information contained within primary sources or other secondary sources. Examples. 1  Autobiographies, memoirs, diaries, emails, oral histories.  Letters, correspondences, eyewitnesses.
Primary Sources. Primary sources are produced usually by a participant or observer at the time an event or development took place (or even at a later date). Primary sources include manuscripts such as letters, diaries, journals, memos. Newspapers, memoirs, and autobiographies also might function as primary sources.