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.
Information sources often are categorized as primary sources, secondary sources, or tertiary sources according to their originality and/or their proximity to the source or origin of their subject matter; however, the boundaries between these categories are sometimes fuzzy and may differ from discipline to discipline.