Double, O., & Wilson, M. Brecht and cabaret: Oliver Double. Michael Wilson. The Cambridge companion to Brecht.(2006).
Lua i Stíl Chicago (17ú heag.)Double, Oliver, agus Michael Wilson. "Brecht and Cabaret: Oliver Double. Michael Wilson." The Cambridge Companion to Brecht.(2006) .
Lua MLA (8ú heag.)Double, Oliver, agus Michael Wilson. "Brecht and Cabaret: Oliver Double. Michael Wilson." The Cambridge Companion to Brecht.(2006), .
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.