Não informado. (1920). Scientific American Monthly. Scientific American.
Lua i Stíl Chicago (17ú heag.)Não informado. Scientific American Monthly. New York: Scientific American, 1920.
Lua MLA (8ú heag.)Não informado. Scientific American Monthly. Scientific American, 1920.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.