"The UFO Enigma- the Definitive Explanation of the UFO Phenomenon" by Donald H. Menzel and Ernest H. Taves

Donald Menzel was on of the first theoretical astronomers and astrophysicists in the U.S. At the age of 16, Menzel enrolled in the University of Denver to study chemistry. He got a bachelor's degree in chemistry and a master's degree in chemistry and mathematics, later getting second master's in astronomy from Princeton University. Menzel was commissioned as a lieutenant commander in the U.S. Navy during WWII. Menzel was skeptic of UFOs and wrote three books to debunk UFOs. Ernest Taves was and American psychiatrist who was a scientific skeptic and wrote another book to debunk UFOs.