Tham khảo Digit (đơn vị)

  1. ↑ Hosch, William L. (ed.) (2010) The Britannica Guide to Numbers and Measurement New York, NY: Britannica Educational Publications, 1st edition. ISBN 978-1-61530-108-9, p.203
  2. 1 2  Chisholm, Hugh biên tập (1911). “Digit”. Encyclopædia Britannica 8 (ấn bản 11). Nhà xuất bản Đại học Cambridge. tr. 268. 
  3. 1 2 Macdonald, A.M. (ed.) (1972) Chambers Twentieth Century Dictionary Edinburgh: W. & R. Chambers ISBN 0-550-10206-X, "digit"
  4. ↑ Plutarchus Chaeronensis, Frank Cole Babbitt (trans.) (1957) Plutarch's Moralia: In fifteen volumes London: William Heinemann, Cambridge, Mass.: Harvard University Press, Volume XII p.144
  5. ↑ Neugebauer, Otto (1975) A History of Ancient Mathematical Astronomy Berlin: Springer, ISBN 978-0-387-06995-1 Volume 2, p.658
  6. ↑ Hockey, Thomas et al. (eds.) (2007) The Biographical Encyclopedia of Astronomers, Springer Reference New York: Springer pp. 1002–1003
  7. ↑ 'Ubayd Allāh ibn Mas'ūd Ṣadr al-S̆arīaẗ al-Aṣġar al-Maḥbūbī, Ahmad S. Dallal (1995) An Islamic response to Greek astronomy: kitāb Ta'dīl hay'at al-aflāk of Ṣadr al-Sharī'a (in Arabic and English) Leiden, New York: E.J. Brill, ISBN 978-90-04-09968-5 p.212
  8. ↑ Heath, Robert (1760). Astronomia accurata; or... subservient to the three principal Subjects. London. tr. ix. 

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