“Country Codes - ISO 3166”. ISO. 2014年8月30日閲覧。 “a three digit numeric code (numeric -3) which can be useful if you need to avoid using Latin script.”
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“ISO 3166 and the UN”. ISO. 2014年10月11日閲覧。 “For example the World Intellectual Property Organization (WIPO) or the UN Economic Commission for Europe (UN/ECE) use the alpha-2 code from ISO 3166-1 for their country coding systems.”
“Links”. ISO. 2014年10月11日閲覧。 “Here is a selection of systems which are not, or only partly, compatible with ISO 3166-1”