What is the author's style in Eyewitness Auschwitz: Three Years in the Gas Chambers by Filip Muller?

Muller, clearly uniquely positioned to describe survival in Auschwitz, offers his reason for writing the autobiography as the moral requirement to bear witness to Nazi atrocities—a feeling implicit in the book's title. He does not attempt to offer a psychological critique or overarching history, but instead confines his observations to a personal nature: indeed, however, he saw more than enough. Thus, the dominant themes of the text include the great insanity of Nazi Germany, the struggle for survival, and the process whereby many people purposefully were destroyed in personality long before their anonymous death.