Well, you're wrong...there are plenty of documents and testimony to confirm the details of World War II, which is what you're referring to. You could start with a book written by Albert Speer, Hitler's architect and armaments minister, called "Inside the Third Reich". Or read the diaries of Victor Klemperer, beginning with "I Will Bear Witness". Or see if you can find English editions of any of the works of Ernst Klee, a German journalist who has written extensively on the Holocaust, or of Joachim Fest, another German historian. The"other side" has written just as much as the victors. You just have to look for it. Also, it would help if you were fluent in German, but there are English editions of many of these books out there. If you really want to learn more about it, get to the library and ask for guidance.