Where can I find primary source doents on why some people escaped the holocaust?

I'm writing a term paper for my history cl and the question is "why did some people escape the holocaust but others didn't?" I need to use primary source doents including doents written by people who were involved in the event, newspaper articles, journals, letters, or autobiographies. I need a link or information as to where i can find one of those because i can't find any. Help?