Pieger, B. (2001). Karl Schefold: 1905-1999 / Bruno Pieger. Castrum Peregrini.
Lua i Stíl Chicago (17ú heag.)Pieger, Bruno. "Karl Schefold: 1905-1999 / Bruno Pieger." Castrum Peregrini 2001.
Lua MLA (8ú heag.)Pieger, Bruno. "Karl Schefold: 1905-1999 / Bruno Pieger." Castrum Peregrini, 2001.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.