APA

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

Chicago

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

Harvard

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

MLA

Brown Gene, .New York: Twenty-Frist Century Books. .