Ovenden, M. (1962). Life in the universe: A scientific discussion. Anchor Books.
Lua i Stíl Chicago (17ú heag.)Ovenden, M.W. Life in the Universe: A Scientific Discussion. Garden City, New York: Anchor Books, 1962.
Lua MLA (9ú heag.)Ovenden, M.W. Life in the Universe: A Scientific Discussion. Anchor Books, 1962.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.