Yi Sang
https://www.epdlp.com/texto.php?id2=4040
https://www.epdlp.com/escritor.php?id=6278
https://kln.or.kr/people/authorsView.do?writerIdx=284
https://es.wikipedia.org/wiki/Yi_Sang
https://ko.wikipedia.org/wiki/%EC%9D%B4%EC%83%81_(%EC%9E%91%EA%B0%80)
