Não informado. (1967). Astrophysical Letters. Gordon and Breach Science Publishers.
Lua i Stíl Chicago (17ú heag.)Não informado. Astrophysical Letters. New York: Gordon and Breach Science Publishers, 1967.
Lua MLA (8ú heag.)Não informado. Astrophysical Letters. Gordon and Breach Science Publishers, 1967.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.