•
Confrontation at Winnipeg: Labour, Industrial Relations, and the General Strike, Montreal: McGill-Queen's University Press, 1974. •
Canada and the Burden of Unity, Macmillan of Canada, 1977. •
Fools and Wise Men, Toronto: Copp Clark Pitman, 1978. • ''Alberta's Coal Industry 1919'', Historical Society of Alberta, 1978. •
Opening the Canadian West, Franklin Watts, 1980. • (with
Robert Bothwell) ''
Canadian Historical Review Volume LXI, University of Toronto Press, 1980. • (with
Jack Granatstein)
Canadian Historical Review Volume LXII, University of Toronto Press, 1981. • (with Jack Granatstein)
Canadian Historical Review Volume LXIII, University of Toronto Press, 1982. •
The Secret Army, Toronto: Lester & Orpen Dennys, 1983. • (with Howard Palmer)
Settling the Canadian West, Toronto: Grolier Limited, 1984. • (with Jack Granatstein)
Great Brain Robbery, Toronto: McClelland & Stewar, 1984. •
Canada and the birth of Israel: A study in Canadian foreign policy, University of Toronto Press, 1985. • (with Douglas Wertheimer)
A Trust Betrayed: The Keegstra Affair, Doubleday, 1985. • (with Jack Granatstein)
Sacred Trust?: Brian Mulroney and the Conservative Party in Power, Doubleday, 1987. •
Canadian Labour History, Toronto: Copp Clark Pitman, 1987. •
The Collins dictionary of Canadian history: 1867 to the present, Collins, 1988. • (with Jack Granatstein)
War and Peacekeeping, Toronto; Key Porter Books, 1990. •
Colonies Canada to 1867, McGraw-Hill Companies, 1992. •
True Patriot: The Life of Brooke Claxton, 1898-1960, University of Toronto Press, 1993. •
Battalion of Heroes: The Calgary Highlanders in World War Two, Calgary: Calgary Highlanders Regimental Funds Foundation, 1994. • (with Jack Granatstein)
Dictionary of Canadian Military History, Oxford: Oxford University Press, 1994. • (with S. F. Wise)
The Valor and the Horror Revisited, Montreal: McGill-Queen's University Press, 1994. • ''Maple Leaf Against the Axis, Canada's Second World War'', Toronto: Stoddart, 1995; Tokyo: Sairyusha, 2003 (Japanese translation). • ''Significant Incident: Canada's Army, the Airborne, and the Murder in Somalia'', Toronto: McClelland and Stewart, 1996. • (with Jack Granatstein & R. Bothwell) ''Petrified Campus: The Crisis in Canada's Universities'', Toronto: Random House of Canada, 1997. • (with Holger H. Herwig)
Deadly Seas: The Story of the St.Croix, the U305 and the Battle of the Atlantic, Toronto: Random House of Canada, 1997. •
Blood on the Hills: The Canadian Army in the Korean War. Toronto: University of Toronto Press, 1999. •
The Patricias: The Proud History of a Fighting Regiment. Toronto: Stoddart, 2001. • (with H. Herwig)
The Destruction of the Bismarck, New York: Overlook Press, 2001; also Toronto: Stoddart, 2001; London: Hutchinson, 2002. • (with Barry Cooper)
Derailed: The Betrayal Of The National Dream, Toronto: Key Porter Books Limited, 2002. • (with Barry Cooper)
Deconfederation: Canada Without Quebec, Toronto: Key Porter Books Limited, 2002. • (with H. Herwig)
One Christmas in Washington: The Secret Meeting Between Roosevelt and Churchill that Changed the World, New York: Overlook Press, 2005. Also, London: Weidenfeld, and Toronto: McArthur & Co. •
The Fighting Canadians: Our Regimental History from New France to Afghanistan, (2008) • (with David Carment)
The World in Canada: Diaspora, Demography, and Domestic Politics, Montreal: McGill-Queen's University Press, 2008. •
The Patricias: A Century of Service, Goose Lane Editions, 2013 • (with Holger H. Herwig) ''Long Night of the Tankers: Hitler's War Against Caribbean Oil'', Calgary: University of Calgary Press, 2014. •
Our Finest Hour, New York City: HarperCollins, 2015. • ''Canada's Air Force''. Toronto: University of Toronto Press, 2024. == See also ==