OECD(비교)

* [[https://ko.m.wikipedia.org/wiki/%EA%B2%BD%EC%A0%9C%ED%98%91%EB%A0%A5%EA%B0%9C%EB%B0%9C%EA%B8%B0%EA%B5%AC|위키백과]]

* [[https://m.terms.naver.com/entry.naver?docId=74711&cid=43667&categoryId=43667|지식백과]]