There are many thousands of books written about the Shoah, WWII, and the Nazi regime. These are just a few of that we have read or browsed through and recommend.
"Survival in Auschwitz : the Nazi Assault on Humanity" by Primo Levi, Stuart Woolf (Translator) Collier Books - pub (Any books by Primo Levi are highly recommended.)
"The World of my Past" by Abraham Biderman Random House Australia
"Hitler's Willing Executioners: Ordinary Germans and the Holocaust" by Daniel Jonah Goldhagen Vintage books
"Auschwitz: A Doctor's Eyewitness Account" by Miklos Nyiszli, et al Arcade Pub
"Five Chimneys" by Olga Lengyel Academy Chicago Publishers
"Death Dealer: The Memoirs of the SS Kommandant at Auschwitz" by Rudolf Hoss, et al Da Capo Pr.
"Amidst a Nightmare of Crime: Manuscripts of Prisoners in Crematorium Squads Found at Auschwitz " Editors: by Jadwiga Bezwinska, Danuta Czech (Editor), K. Michalik (Translator) Howard Fertig
"Night" by Elie Wiesel, et al Bantam Books
"Anne Frank the Diary of a Young Girl" by Anne Frank, et al Bantam Books
"Anatomy of the Auschwitz Death Camp" by Israel Gutman(Editor), et al Indiana University Press
" The Holocaust : A History of the Jews of Europe During the Second World War" by Martin Gilbert Henry Holt
You can read our account of the later years of Oskar Schindler here