時計の歴史
From Sundials to Atomic Clocks: Understanding Time and Frequency 2nd (revised) edition. Mineola, New York: Dover Publications. pp. p. 345. ISBN 0486409139
Jones, Tony (2000). Splitting the Second: The Story of Atomic Timekeeping. Bristol, UK: Institute of Physics Publishing. pp. p. 199. ISBN 978-0750306409
Landes, Davis S (2000). A Revolution in Time: Clocks and the Making of the Modern World. Cambridge, Massachusetts: Harvard University Press. pp. p. 518. ISBN 978-0674768000
Lombardi, Michael A., NIST Time and Frequency Services, NIST Special Publication 432*, revised 2002.
Mayr, Otto (October 1970). “The Origins of Feedback Control”. Scientific American 223 (10): pp. 110–118.