Parkin, K. (1969). Ideal voice and speech training: A book of exercises (Rev., with additional material.). S. French.
Lua i Stíl Chicago (17ú heag.)Parkin, Ken. Ideal Voice and Speech Training: A Book of Exercises. Rev., with additional material. London ; New York: S. French, 1969.
Lua MLA (9ú heag.)Parkin, Ken. Ideal Voice and Speech Training: A Book of Exercises. Rev., with additional material. S. French, 1969.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.