MLA

Tuchman, Barbara W. The Proud Tower : a Portrait of the World Before the War, 1890-1914. New York: Macmillan, 1966.

APA

Tuchman, B. W. (1966). The proud tower : a portrait of the world before the war, 1890-1914. New York: Macmillan.

Chicago

Tuchman, Barbara W. The Proud Tower: A Portrait of the World before the War, 1890-1914. New York: Macmillan, 1966.