Friedrich, O. (1973). Before the Deluge: A Portrait of Berlin in the 1920's (1. Aufl.). Avon Books.
Lua i Stíl Chicago (17ú heag.)Friedrich, Otto. Before the Deluge: A Portrait of Berlin in the 1920's. 1. Aufl. New York: Avon Books, 1973.
Lua MLA (8ú heag.)Friedrich, Otto. Before the Deluge: A Portrait of Berlin in the 1920's. 1. Aufl. Avon Books, 1973.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.