• [2] UTS #35: Unicode Locale Data Markup Language (2018-10-11 06:15:59 +09:00) http://unicode.org/reports/tr35/#UnicodeNumberSystemIdentifier
• [1] UTS #35: Unicode LDML: Numbers (2018-10-11 06:15:54 +09:00) https://unicode.org/reports/tr35/tr35-numbers.html#Numbering_Systems
• [3] (2018-04-07 02:54:04 +09:00) http://unicode.org/repos/cldr/trunk/common/bcp47/number.xml

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