Roe, P. F. (1970). Choral music education. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Roe, Paul F. Choral Music Education. Englewood Cliffs, N.J: Prentice-Hall, 1970.
Lua MLA (9ú heag.)Roe, Paul F. Choral Music Education. Prentice-Hall, 1970.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.