Farrer, D. (1975). The Warburgs: The story of a family. Stein and Day.
Lua i Stíl Chicago (17ú heag.)Farrer, David. The Warburgs: The Story of a Family. New York: Stein and Day, 1975.
Lua MLA (8ú heag.)Farrer, David. The Warburgs: The Story of a Family. Stein and Day, 1975.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.