http://db.history.go.kr/item/level.do?levelId=npda_1923_05_05_v0004_0740
https://www.nl.go.kr/newspaper/detail.do?content_id=CNTS-00094060761&from=%EC%8B%A0%EB%AC%B8%20%EA%B2%80%EC%83%89
http://db.history.go.kr/item/level.do?levelId=npda_1929_01_31_v0002_0160