Rolland, R. (1952). Ludwig van Beethoven. Rütten & Loening.
Lua i Stíl Chicago (17ú heag.)Rolland, Romain. Ludwig Van Beethoven. Berlin: Rütten & Loening, 1952.
Lua MLA (8ú heag.)Rolland, Romain. Ludwig Van Beethoven. Rütten & Loening, 1952.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.