Compton, F. E. Compton´s Encyclopedia and fact-index: S-SOUND.
Lua i Stíl Chicago (17ú heag.)Compton, F. E. Compton´s Encyclopedia and Fact-index: S-SOUND.
Lua MLA (8ú heag.)Compton, F. E. Compton´s Encyclopedia and Fact-index: S-SOUND.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.