http://db.history.go.kr/item/level.do?levelId=npda_1925_09_05_v0004_1170
http://db.history.go.kr/item/level.do?levelId=npda_1931_05_03_v0003_0470
https://nl.go.kr/newspaper/detail.do?content_id=CNTS-00093866561&from=%EC%8B%A0%EB%AC%B8%20%EA%B2%80%EC%83%89
http://db.history.go.kr/item/level.do?levelId=npda_1931_03_01_v0001_0040