APA (7th ed.) Citation

Barnes, H. E. (1926). The genesis of the world war: An introduction to the problem of war guilt. A.A. Knopf.

Chicago Style (17th ed.) Citation

Barnes, Harry Elmer. The Genesis of the World War: An Introduction to the Problem of War Guilt. New York: A.A. Knopf, 1926.

MLA (9th ed.) Citation

Barnes, Harry Elmer. The Genesis of the World War: An Introduction to the Problem of War Guilt. A.A. Knopf, 1926.