Não informado. (1933). American Physics Teacher. American Association of Physics Teachers.
Lua i Stíl Chicago (17ú heag.)Não informado. American Physics Teacher. New York: American Association of Physics Teachers, 1933.
Lua MLA (8ú heag.)Não informado. American Physics Teacher. American Association of Physics Teachers, 1933.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.