Knapp, G. P. (1980). Theodor W. Adorno. Colloquium-Verlag.
Lua i Stíl Chicago (17ú heag.)Knapp, Gerhard P. Theodor W. Adorno. Berlin: Colloquium-Verlag, 1980.
Lua MLA (8ú heag.)Knapp, Gerhard P. Theodor W. Adorno. Colloquium-Verlag, 1980.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.