APA (7th ed.) Zitazioa

Clark, R. (1961). The universe: Plan or accident? Muhlenberg Press.

Chicago Style (17th ed.) Zitazioa

Clark, Robert. The Universe: Plan or Accident? Philadelphia: Muhlenberg Press, 1961.

MLA (9th ed.) Zitazioa

Clark, Robert. The Universe: Plan or Accident? Muhlenberg Press, 1961.