Não informado. (1939). Advancement of Science. British Association for the Advancement of Science.
Lua i Stíl Chicago (17ú heag.)Não informado. Advancement of Science. London: British Association for the Advancement of Science, 1939.
Lua MLA (8ú heag.)Não informado. Advancement of Science. British Association for the Advancement of Science, 1939.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.