Christy, V. A., & Paton, J. G. (2002). Foundations in singing: A basic textbook in vocal technique and song interpretation (7th ed.). McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Christy, Van Ambrose, agus John Glenn Paton. Foundations in Singing: A Basic Textbook in Vocal Technique and Song Interpretation. 7th ed. Boston: McGraw-Hill, 2002.
Lua MLA (9ú heag.)Christy, Van Ambrose, agus John Glenn Paton. Foundations in Singing: A Basic Textbook in Vocal Technique and Song Interpretation. 7th ed. McGraw-Hill, 2002.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.