APA (7th ed.) Zitazioa
Fisher, H. B. (1975). Improving voice and articulation (2nd ed.). Houghton.
Chicago Style (17th ed.) Zitazioa
Fisher, Hilda B. Improving Voice and Articulation. 2nd ed. Boston: Houghton, 1975.
MLA (9th ed.) Zitazioa
Fisher, Hilda B. Improving Voice and Articulation. 2nd ed. Houghton, 1975.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.