Furness, R. S. (1973). Expressionism. Methuen.
Lua i Stíl Chicago (17ú heag.)Furness, R. S. Expressionism. London: Methuen, 1973.
Lua MLA (8ú heag.)Furness, R. S. Expressionism. Methuen, 1973.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.