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Robert Martin, The Liar Paradox, Yale University Press, 1970.
Mauriee Kraitchik, Mathematical Entertainment, Dover, 1953.
Martin gardner, Mathematics, Magic and Secrets, Dover, 1956.
Paul R. halmos, Simple Set Theory, Van Nordstrand, 1960.
Casner, Sdwarol and Jannes R. Newman, Mathematics and Imagination, Simon &; Schuster, 1940
Martin gardner, Two-sided Universe, Basic Books, 1964.
Richard Gale, Philosophy of Time, Fenhill, 1968.
Bertrand Russell, Our Understanding of the External World, Humanities, 196 1.
Philip Van Doren Stern, Time Traveler, Two Days, 1947.
Edwin F Taylor & john wheeler, Space-Time Physics, Freeman, 1966.