GRUNFELD, F. V. (1973). Berlin. Time-Life Books.
Lua i Stíl Chicago (17ú heag.)GRUNFELD, Frederic V. Berlin. Amsterdam: Time-Life Books, 1973.
Lua MLA (9ú heag.)GRUNFELD, Frederic V. Berlin. Time-Life Books, 1973.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.