https://www.nl.go.kr/newspaper/detail.do?content_id=CNTS-00094211111&from=%EC%8B%A0%EB%AC%B8%20%EA%B2%80%EC%83%89
http://db.history.go.kr/item/level.do?levelId=npda_1938_09_09_w0004_0690
http://db.history.go.kr/item/level.do?levelId=npda_1928_09_28_v0004_0700
http://db.history.go.kr/item/level.do?levelId=npda_1924_11_03_v0005_1290