Finding your own related texts is really important so that you're bringing your own ideas to the response. The texts need to be about the interplay of history and memory and don't have to be about the holocaust or the second world war. One area that is useful is a documentary-maybe soldiers discussing their experiences of war (there are plenty on television around Anzac Day), or women remembering their time as prisoner of war. There are many poems written by concentration camp survivors (just google them) or films examining real characters (Philomena? The Railway Man?) based on their memories of factual events. All the best.