Não informado. (1940). American Journal of Physics. American Institute of Physics.
Lua i Stíl Chicago (17ú heag.)Não informado. American Journal of Physics. New York: American Institute of Physics, 1940.
Lua MLA (8ú heag.)Não informado. American Journal of Physics. American Institute of Physics, 1940.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.