http://db.history.go.kr/item/level.do?levelId=npda_1925_04_13_v0003_0870
https://nl.go.kr/newspaper/detail.do?content_id=CNTS-00094221072&from=%EC%8B%A0%EB%AC%B8%20%EA%B2%80%EC%83%89
http://db.history.go.kr/item/level.do?levelId=npda_1922_08_23_v0004_0730
http://db.history.go.kr/item/level.do?levelId=npda_1923_04_11_v0004_1120
http://db.history.go.kr/item/level.do?levelId=npda_1925_05_29_y0001_1080