Não informado. (1920). Discovery: The magazine of scientific progress. Professional and Industrial Publishing.
Lua i Stíl Chicago (17ú heag.)Não informado. Discovery: The Magazine of Scientific Progress. London: Professional and Industrial Publishing, 1920.
Lua MLA (8ú heag.)Não informado. Discovery: The Magazine of Scientific Progress. Professional and Industrial Publishing, 1920.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.