Friedrich, O. (1995). Before the deluge: A portrait of Berlin in the 1920s. HarperPerennial a Division of HarperCollinsPublishers.
Citazione stile Chigago Style (17a edizione)Friedrich, Otto. Before the Deluge: A Portrait of Berlin in the 1920s. New York: HarperPerennial a Division of HarperCollinsPublishers, 1995.
Citatione MLA (9a ed.)Friedrich, Otto. Before the Deluge: A Portrait of Berlin in the 1920s. HarperPerennial a Division of HarperCollinsPublishers, 1995.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.