In-bo Jeong, “Ep.9, The Revival of Goguryeo (ep. 6): Joseon’s Five Thousand Years of Spirit/Ol [九、高句麗 再振(六) 五千年間朝鮮 「얼」]- Page 1 General,” Dong-A Digital Archive, December 31, 1935, https://www.donga.com/archive/newslibrary/view?ymd=19351231 .
“Dasan Jeong Yak-yong’s Yeoyudangjeonseo, a Wisdom for Life Found in the Cultural Records of the History, [다산 정약용의 여유당전서, 과거 문화기록에서 삶의 지혜를 찾다],” Naver Diary- Naver Official Blog, https://blog.naver.com/naver_diary/221358776769 .