Bass, E. (1954). Zirkus Umberto. Artia.
Lua i Stíl Chicago (17ú heag.)Bass, Eduard. Zirkus Umberto. Prag: Artia, 1954.
Lua MLA (8ú heag.)Bass, Eduard. Zirkus Umberto. Artia, 1954.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.