真正的“5-25”语言,其中25是5中较高的一组,古马其语数字系统如下所示: Harald Hammarström, Rarities in Numeral Systems: "Bases 5, 10, and 20 are omnipresent." doi:10.1515/9783110220933
Gorgoniev, Yu A. Khmer language. 1961: 72. Jacob. Notes on the numerals and numeral coefficients in Old, Middle, and Modern Khmer (PDF). 1993: 28 [2012-12-19]
(Bonji) Numbers(页面存档备份,存于互联网档案馆) Karl Menninger, Number Words and Number Symbols - A Cultural History of Numbers ISBN 0-486-27096-3 [1](页面存档备份,存于互联网档案馆)
9781853752926。 Lam Lai Yong,A Chinese Genesis, Rewriting the history of our numeral system. Archive for History of Exact Science 38 101-108 Lam Lay Yong, Fleeting