Não informado. (1969). Astronomy and Astrophysics Abstracts. Astronomisches Recheninstitut.
Lua i Stíl Chicago (17ú heag.)Não informado. Astronomy and Astrophysics Abstracts. Berlin: Astronomisches Recheninstitut, 1969.
Lua MLA (8ú heag.)Não informado. Astronomy and Astrophysics Abstracts. Astronomisches Recheninstitut, 1969.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.