(1983). Richard Ziegler: The Berlin Twenties.
Lua i Stíl Chicago (17ú heag.)Richard Ziegler: The Berlin Twenties. London, 1983.
Lua MLA (8ú heag.)Richard Ziegler: The Berlin Twenties. 1983.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.