A primary source is a first-hand account of an event. To Search the online catalog for primary sources, use Subject Headings for your topic and add words like
For example: Germany -History- WWII -1939-1945--Personal narratives)
This is a selection of digital library sites on holocasut sources
Nuernberg Trials
The Blue Series Trial of the Major War Criminals before the International Military Tribunal Nuremberg, 14 November 1945 - 1 October 1946. This 42-volume series, also known as “The Blue Series,”
The Red Series
Nazi Conspiracy and Aggression. Office of the United States Chief of Counsel For Prosecution of Axis Criminality. Nuremberg, Germany (1945-1946). This eight-volume, 12-book series, also known as “The Red Series,”
Nurnberg Final Report by Telford Taylor, Brigadier General, U.S.A. Chief of Counsel for War Crimes. Washington, D.C., 15 August 1949
Below are listed some of the Library of Congress Subject Heading that are pertinent to research in this area.
Pius XII, Pope, 1876-1958 -- Relations with Jews
Catholic Church -- Relations -- Judaism
Jews -- Persecutions -- Italy
Holocaust, Jewish (1939-1945) -- Italy
World War, 1939-1945 -- Religious aspects -- Catholic Church
Judaism -- Relations -- Catholic Church
Antisemitism -- Italy
Italy -- History -- 1914-1945