Rolfs, R. W. (1996). The sorcerer's apprentice: The life of Franz von Papen. University Press of America.
Lua i Stíl Chicago (17ú heag.)Rolfs, Richard W. The Sorcerer's Apprentice: The Life of Franz Von Papen. Lanham: University Press of America, 1996.
Lua MLA (8ú heag.)Rolfs, Richard W. The Sorcerer's Apprentice: The Life of Franz Von Papen. University Press of America, 1996.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.