APA (7th ed.) Citation

Brown, G. (1993). Conflict in Europe and the Great Depression: World War I (1914-1940). Twenty-First Century Books.

Chicago Style (17th ed.) Citation

Brown, Gene. Conflict in Europe and the Great Depression: World War I (1914-1940). New York: Twenty-First Century Books, 1993.

MLA (9th ed.) Citation

Brown, Gene. Conflict in Europe and the Great Depression: World War I (1914-1940). Twenty-First Century Books, 1993.