Lua APA (7ú heag.)
Helbo, A. (1987). Theory of performing arts. Benjamins.
Lua i Stíl Chicago (17ú heag.)
Helbo, André. Theory of Performing Arts. Amsterdam ; Philadelphia: Benjamins, 1987.
Lua MLA (9ú heag.)
Helbo, André. Theory of Performing Arts. Benjamins, 1987.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.