Howard, D. M., Nix, J., & Welch, G. (2020). The Oxford handbook of singing. Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Howard, David M., John Nix, agus Graham Welch. The Oxford Handbook of Singing. Oxford, England: Oxford University Press, 2020.
Lua MLA (9ú heag.)Howard, David M., et al. The Oxford Handbook of Singing. Oxford University Press, 2020.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.