Transformation of a Continent: Europe in the Twentieth Century. Minneapolis, Minn.: Burgess Pub. Co., 1975, ISBN 0-8087-2332-4.
The Foreign Policy of Hitler’s Germany: Starting World War II, 1937—1939. Chicago: University of Chicago Press, 1980, ISBN 0-226-88511-9.
World in the Balance: Behind the Scenes of World War II, Hanover, New Hampshire: Published for Brandeis University Press by University Press of New England, 1981, ISBN 0-87451-216-6.
Germany, Hitler, and World War II: Essays in Modern German and World History. Cambridge [England] ; New York : Cambridge University Press, 1995, ISBN 0-521-47407-8.
Hitler’s Second Book: The Unpublished Sequel to Mein Kampf, Enigma Books, 2003 ISBN 1-929631-16-2.
Visions of Victory: The Hopes of Eight World War II Leaders. New York: Cambridge University Press, 2005, ISBN 0-521-85254-4.
Hitler’s Table Talk 1941—1944: Secret Conversations. New York: Enigma Books, 2007, ISBN 978-1-936274-93-2.
Hitler’s Foreign Policy, 1933—1939: The Road to World War II. New York: Enigma Books, 2010 ISBN 978-1-929631-91-9.