Gilbert, F. (1970). The end of the European era, 1890 to the present. W.W. Norton.
Cita Chicago Style (17a ed.)Gilbert, Felix. The End of the European Era, 1890 to the Present. New York: W.W. Norton, 1970.
Cita MLA (9a ed.)Gilbert, Felix. The End of the European Era, 1890 to the Present. W.W. Norton, 1970.
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