As this is a biography I believe it is a secondary source
Explanation:
Primary sources provide a first-hand account of an event and is authoritative. They represent original thinking or events they can share new information. Secondary sources involve analysis or evaluation of primary sources. For example, an autobiography is a primary source while a biography is a secondary source.
Night by Ellie is a very good book to show historical events about Nazi Germany and how they treated territories that were occupied under Hitler. It does depict how life and living styles was like in Nazi controlled territories. That is my best shot at answering this, hope ur satisfied ;)
