Sullivan, W. (1966). We are not alone: The search for intelligent life on other worlds (Rev. ed.). New American Library.
Citace podle Chicago (17th ed.)Sullivan, Walter. We Are Not Alone: The Search for Intelligent Life on Other Worlds. Rev. ed. New York: New American Library, 1966.
Citace podle MLA (9th ed.)Sullivan, Walter. We Are Not Alone: The Search for Intelligent Life on Other Worlds. Rev. ed. New American Library, 1966.
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