Pohl, N. (2023). Curator's Key: Curators talk about a work they keep coming back to : Nina Pohl on Sigmar Polke's Höhere Wesen befahlen: rechte obere Ecke schwarz malen! (1969). Spike.
Lua i Stíl Chicago (17ú heag.)Pohl, Nina. "Curator's Key: Curators Talk About a Work They Keep Coming Back to : Nina Pohl on Sigmar Polke's Höhere Wesen Befahlen: Rechte Obere Ecke Schwarz Malen! (1969)." Spike 2023.
Lua MLA (8ú heag.)Pohl, Nina. "Curator's Key: Curators Talk About a Work They Keep Coming Back to : Nina Pohl on Sigmar Polke's Höhere Wesen Befahlen: Rechte Obere Ecke Schwarz Malen! (1969)." Spike, 2023.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.