Würthner, R. (1958). Gradus ad Parnassum. Hohner.
Lua i Stíl Chicago (17ú heag.)Würthner, Rudolf. Gradus Ad Parnassum. Trossingen: Hohner, 1958.
Lua MLA (8ú heag.)Würthner, Rudolf. Gradus Ad Parnassum. Hohner, 1958.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.