Sontag, R. J. (1933). European diplomatic history 1871 - 1932. New York: The Century.
Trích dẫn kiểu ChicagoSontag, Raymond James. European Diplomatic History 1871 - 1932. New York: The Century, 1933.
MLA引文Sontag, Raymond James. European Diplomatic History 1871 - 1932. New York: The Century, 1933.
警告：這些引文格式不一定是100％准確.