Coddington, A. (2018). Aliens, UFOs, and unexplained encounters (First edition.). Cavendish Square.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCoddington, Andrew. Aliens, UFOs, and Unexplained Encounters. First edition. New York: Cavendish Square, 2018.
एमएलए (8वां संस्करण) प्रशस्ति पत्रCoddington, Andrew. Aliens, UFOs, and Unexplained Encounters. First edition. Cavendish Square, 2018.
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