Elchinger, R. (1924). Beethovens Briefe. Hirth.
Lua i Stíl Chicago (17ú heag.)Elchinger, Richard. Beethovens Briefe. München: Hirth, 1924.
Lua MLA (8ú heag.)Elchinger, Richard. Beethovens Briefe. Hirth, 1924.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.