APA (7th ed.) Zitazioa
Helbo, A. (1987). Theory of performing arts. Benjamins.
Chicago Style (17th ed.) Zitazioa
Helbo, André. Theory of Performing Arts. Amsterdam ; Philadelphia: Benjamins, 1987.
MLA (9th ed.) Zitazioa
Helbo, André. Theory of Performing Arts. Benjamins, 1987.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.