George, S., & Wolters, F. (1998). Briefwechsel. Castrum Peregrini.
Lua i Stíl Chicago (17ú heag.)George, Stefan, agus Friedrich Wolters. "Briefwechsel." Castrum Peregrini 1998.
Lua MLA (8ú heag.)George, Stefan, agus Friedrich Wolters. "Briefwechsel." Castrum Peregrini, 1998.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.