11B10.30 - Circadian Rhythms - Biological Clocks
- Robert Ehrlich and Ronald Helms, "A Most Unnatural Rhythm", TPT, Vol. 19, # 1, Jan. 1981, p. 39.
- Dr. Finck, "Measuring the Heartbeat of a Spider", TPT, Vol. 19, # 5, May 1981, p. back cover.
- Eric T. Pengelley and Sally J. Asmundson, "Annual Biological Clocks", Scientific American, Vol. 224, # 4, Apr. 1971, p. 73.
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