Clark, R. E. D. (1972). The universe: Plan or accident? Zondervan.
Lua i Stíl Chicago (17ú heag.)Clark, Robert E. D. The Universe: Plan or Accident? Zondervan, 1972.
Lua MLA (9ú heag.)Clark, Robert E. D. The Universe: Plan or Accident? Zondervan, 1972.
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