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 CitationSontag, Raymond James. European Diplomatic History 1871 - 1932. New York: The Century, 1933.
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