https://nl.go.kr/newspaper/detail.do?content_id=CNTS-00065309634&from=%EC%8B%A0%EB%AC%B8%20%EA%B2%80%EC%83%89
https://www.nl.go.kr/newspaper/detail.do?content_id=CNTS-00065294321&from=%EC%8B%A0%EB%AC%B8%20%EA%B2%80%EC%83%89
https://www.nl.go.kr/newspaper/detail.do?content_id=CNTS-00115182166&from=%EC%8B%A0%EB%AC%B8%20%EA%B2%80%EC%83%89
http://db.history.go.kr/item/level.do?levelId=npda_1956_10_24_x005F0350