The Racial State: Germany 1933–1945 – with Wolfgang Wippermann. Cambridge University Press, 1991

Death and Deliverance: Euthanasia in Germany 1900–1945. Cambridge University Press, 1994

Confronting the Nazi Past. St Martin's Press, 1995

Ethics and Extermination: Reflections on Nazi Genocide. Cambridge University Press, 1997

The Third Reich: A New History. Macmillan, 2000

I haven't read anything later than these because my sickbag isn't big enough.