Cita APA (7th ed.)

Sontag, R. J. (1933). European diplomatic history, 1871-1932. Appleton-Century-Crofts.

Cita Chicago (17th ed.)

Sontag, Raymond James. European Diplomatic History, 1871-1932. New York: Appleton-Century-Crofts, 1933.

Cita MLA (9th ed.)

Sontag, Raymond James. European Diplomatic History, 1871-1932. Appleton-Century-Crofts, 1933.