APA (7th ed.) Zitazioa
Helbo, A. (1991). Approaching Theatre. Indiana University Press.
Chicago Style (17th ed.) Zitazioa
Helbo, Andre. Approaching Theatre. Bloomington: Indiana University Press, 1991.
MLA (9th ed.) Zitazioa
Helbo, Andre. Approaching Theatre. Indiana University Press, 1991.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.