APA

Sontag R. J., . (19611933). European diplomatic history, 1871-1932. New York : London: The Century co.

Chicago

Sontag Raymond James, . 19611933. European diplomatic history, 1871-1932. New York : London: The Century co.

Harvard

Sontag R. J., . (19611933). European diplomatic history, 1871-1932. New York : London: The Century co.

MLA

Sontag Raymond James, . European diplomatic history, 1871-1932. New York : London: The Century co. 19611933.