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Bainbridge, William S. "Biorhythms: Evaluating a Pseudo-science." Skeptical Inquirer (spring/summer 1978): 41-56.
Gittelson, Bernard. Bio-Rhythms: A Personal Science. New York: Warner Books, 1977.
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??. Biological Rhythms in Psychiatry and Medicine. Washington, D.C.: National Institute of Mental Health, 1970.
Reprinted as Biological Rhythms in Human and Animal Physiology. New York: Dover Books, 1971.
Schadewald, Robert. "Biorhythms: A Critical Look at Critical Days." Fate (February 1979): 75-80.
Thommen, George. Is This Your Day? New York: Award, 1964.
Wernli, Hans J. Biorhythm: A Scientific Exploration into the Life Cycles of the Individual. New York: Crown, 1961.