Helbo, A. (1991). Approaching Theatre. Indiana University Press.
Lua i Stíl Chicago (17ú heag.)Helbo, Andre. Approaching Theatre. Bloomington: Indiana University Press, 1991.
Lua MLA (9ú heag.)Helbo, Andre. Approaching Theatre. Indiana University Press, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.