APA (7th ed.) Citation

Sullivan, W. (1966). We are not alone: The search for intelligent life on other worlds (Rev. ed.). New American Library.

Chicago Style (17th ed.) Citation

Sullivan, Walter. We Are Not Alone: The Search for Intelligent Life on Other Worlds. Rev. ed. New York: New American Library, 1966.

MLA (9th ed.) Citation

Sullivan, Walter. We Are Not Alone: The Search for Intelligent Life on Other Worlds. Rev. ed. New American Library, 1966.