Mann, P. (1987). Hugo Ball: An intellectual biography.
Lua i Stíl Chicago (17ú heag.)Mann, Philip. Hugo Ball: An Intellectual Biography. London, 1987.
Lua MLA (8ú heag.)Mann, Philip. Hugo Ball: An Intellectual Biography. 1987.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.