QUESTION -- PRIMARY SOURCES: Which source is considered a “primary” source?
The book, "Helga’s Diary: a Young Girl’s Account of Life in a Concentration Camp" by Helga Weissová
The book, "Explaining the Holocaust: How and Why it Happened" by Mordecai Schrieber
The journal article, “The Concentration Camp and Development: the Pasts and Future of Genocide” by Vinay Lal
The newspaper article, "German Doctors Played Role in Terror of the Holocaust, Historian Says” by Matthew Nojiri