http://db.history.go.kr/item/level.do?levelId=npda_1923_11_20_v0004_0970
https://nl.go.kr/newspaper/detail.do?content_id=CNTS-00093857077&from=%EC%8B%A0%EB%AC%B8%20%EA%B2%80%EC%83%89
http://db.history.go.kr/item/level.do?levelId=npda_1920_04_23_v0004_0780
http://db.history.go.kr/item/level.do?levelId=npda_1931_06_23_v0003_0470
https://www.nl.go.kr/newspaper/detail.do?content_id=CNTS-00093735505&from=%EC%8B%A0%EB%AC%B8%20%EA%B2%80%EC%83%89