Kogohakcha Cho Yu-jŏn kwa Yi Ki-hwan ŭi Han'guksa kihaengYu-jŏn Cho · First published 2010Open the Tome
Yu Sŏng-nyong, Kim Sŏng-il, Cho Hŏn, Kwak Chae-u, U Sŏng-jŏn, oeNak-hun Sŏng · First published 1977Open the Tome
