Konghang kanŭn kilSug-yŏn Yi, Chʻŏl-gyu Kim, Ha-nŭl Kim, Sang-yun Yi · First published 2017Open the Tome
Kuksa P'yŏnch'an Wiwŏnhoe sujip Chungguk, Taeman charyo p'yŏllamSang-il Yi, Ha, Hye-jŏng (Sinologist) · First published 2014Open the Tome
Hanʾguk sahoe ŭi pulpʻyŏngdŭng kwa hyŏngpʻyŏngSang-u Yi, Yŏng-sŏn Ha · First published 1992Open the Tome