[[X-8]] Menger, H. From Outer Space To You. Clarksburg, West Virginia: Saucerian Publications, 1959.
[[X-9]] Peterborough (N.H.) Transcript, Oct. 30, 1958.
[[X-10]] Leslie, D., and Adamski, G. Flying Saucers Have Landed. New York: British Book Centre, 1953.
[[X-11]] Adamski, G. Inside the Space Ships. Abelard-Schuman, 1955.
[[X-12]] —— Flying Saucers, Farewell. Abelard-Schuman, 1961.
[[X-13]] UFO Investigator (June 1959).
[[X-14]] Michel, A. The Truth about Flying Saucers. New York: Criterion Books, 1956.
[[X-15]] “Have We Visitors from Outer Space?” Life magazine (April 4, 1952).
[[X-16]] Rio de Janeiro: O Cruzeiro, May 17, 1952.
[[X-17]] Civilian Saucer Investigations Quarterly Bulletin (September 1952).