Heymann, F. G. (1965). George of Bohemia, King of Heretics. Princeton University Press.
Lua i Stíl Chicago (17ú heag.)Heymann, Frederick Gotthold. George of Bohemia, King of Heretics. Princeton, N.J: Princeton University Press, 1965.
Lua MLA (9ú heag.)Heymann, Frederick Gotthold. George of Bohemia, King of Heretics. Princeton University Press, 1965.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.