Obert, K. B., & Chicurel, S. R. (2005). Geography of the voice.
Lua i Stíl Chicago (17ú heag.)Obert, Kerrie B., agus Steven R. Chicurel. Geography of the Voice. Think Voice International, 2005.
Lua MLA (9ú heag.)Obert, Kerrie B., agus Steven R. Chicurel. Geography of the Voice. 2005.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.