Johnson, D. J. (1997). Choral techniques: Beyond the basics : practical suggestions for choral conductors of school groups and community and church choirs. Neil A. Kjos Music.
Lua i Stíl Chicago (17ú heag.)Johnson, Deral J. Choral Techniques: Beyond the Basics : Practical Suggestions for Choral Conductors of School Groups and Community and Church Choirs. San Diego, Calif: Neil A. Kjos Music, 1997.
Lua MLA (9ú heag.)Johnson, Deral J. Choral Techniques: Beyond the Basics : Practical Suggestions for Choral Conductors of School Groups and Community and Church Choirs. Neil A. Kjos Music, 1997.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.