Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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