Bernal, J. D. (1967). The origin of life. The World Publishing.
Lua i Stíl Chicago (17ú heag.)Bernal, J. D. The Origin of Life. Cleveland: The World Publishing, 1967.
Lua MLA (9ú heag.)Bernal, J. D. The Origin of Life. The World Publishing, 1967.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.