Não informado. (1956). Minnesota Studies in the Philosophy of Science. Minnesota Center of Philosophy of Science.
Lua i Stíl Chicago (17ú heag.)Não informado. Minnesota Studies in the Philosophy of Science. Minneapolis, Minn: Minnesota Center of Philosophy of Science, 1956.
Lua MLA (8ú heag.)Não informado. Minnesota Studies in the Philosophy of Science. Minnesota Center of Philosophy of Science, 1956.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.