Tham khảo Hệ_thập_phân

  1. The History of Arithmetic, Louis Charles Karpinski, 200 trang, Rand McNally & Company, 1925.
  2. Histoire universelle des chiffres, Georges Ifrah, Robert Laffont, 1994 (hay The Universal History of Numbers: From prehistory to the invention of the computer, Georges Ifrah, ISBN 0-471-39340-1, John Wiley and Sons Inc., New York, 2000. David Bellos dịch từ bản tiếng Pháp, E.F. Harding, Sophie Wood and Ian Monk)

Tài liệu tham khảo

WikiPedia: Hệ_thập_phân http://www2.hursley.ibm.com/decimal/decifaq.html http://www.kwiznet.com/p/takeQuiz.php?ChapterID=13... http://www.kwiznet.com/p/takeQuiz.php?ChapterID=13... http://www.kwiznet.com/p/takeQuiz.php?ChapterID=73... http://www.mathsisfun.com/converting-decimals-frac... http://www.mathsisfun.com/worksheets/decimals.php http://www.mpiwg-berlin.mpg.de/Preprints/P183.PDF http://spot.colorado.edu/~gubermas/NCTM_pap.htm http://www.chn.ir/english/eshownews.asp?no=1622 http://www.apa.org/monitor/apr99/english.html