Hanʼguk kodae kukka hyŏngsŏng sigi ŭi kogohakchŏk yŏnʼguIn-gu Kang · First published 1991Open the Tome
Hanʼguk ŭi chŏnbang huwŏnbun Mugisan kwa Changgoksan chʻŭngnyang chosa pogosŏIn-gu Kang · First published 1987Open the Tome