Cita APA (7a ed.)

Sullivan, W. (1966). We are not alone: : The search for intelligent life on other worlds. Mc Graw-Hill.

Cita Chicago Style (17a ed.)

Sullivan, Walter. We Are Not Alone: : The Search for Intelligent Life on Other Worlds. New York: Mc Graw-Hill, 1966.

Cita MLA (9a ed.)

Sullivan, Walter. We Are Not Alone: : The Search for Intelligent Life on Other Worlds. Mc Graw-Hill, 1966.