Leach, E. R., 1954, Primitive Time Reckoning, in Singer, C., Holmyard, E. J., and Hall, A. R., eds., THe History of Technology: London, Oxford University Press.

Neugebauer, O., 1954, Ancient Mathematics and Astronomy, in Singer, C., Holmyard, E. J., and Hall, A. R., eds., THe History of Technology: London, Oxford University Press.

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