style Roman numerals for the 1990s?. The Straight Dope. 1990-02-23 [2020-05-17]. (原始内容存档于2016-03-21). Hayes, David P. Guide to Roman Numerals. Copyright
引文使用过时参数coauthor (帮助) Gorgoniev, Yu A. Khmer language. 1961: 72. Jacob. Notes on the numerals and numeral coefficients in Old, Middle, and Modern Khmer (PDF). 1993: