Dettmann, P. (1997). Fritz Cremer.
Lua i Stíl Chicago (17ú heag.)Dettmann, Peter. Fritz Cremer. Berlin, 1997.
Lua MLA (8ú heag.)Dettmann, Peter. Fritz Cremer. 1997.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.
Dettmann, P. (1997). Fritz Cremer.
Lua i Stíl Chicago (17ú heag.)Dettmann, Peter. Fritz Cremer. Berlin, 1997.
Lua MLA (8ú heag.)Dettmann, Peter. Fritz Cremer. 1997.