- "A Study in Austrian Intellectual History: From Late Baroque to Romanticism" (1930)
- "The Habsburg Empire: A Study in Integration and Disintegration" (1957)
- "The Paradox of Nationalities in Europe" (1968)
- "A History of the Habsburg Empire: 1526-1918" (1974)
- "Empire and Diplomacy in the North Atlantic: The United States, Britain, and France in the Twentieth Century" (1980)
Kann's work is praised for its breadth of knowledge, depth of analysis, and balanced perspective on historical events. He was a respected scholar and his books continue to be influential in the field of Austrian and Habsburg history.