Suip ssal kachʻi pʻyŏngka mit sobi taechʻe hyokwa punsŏkTong-gyu Pak · First published 2006Open the Tome
Kukka sanŏp kisul chŏngchʻaek tonghyang mit kisul kaebal chiwŏn chedo ŭi sŏnjinhwa =Tong-gyu Pak · First published 2000Open the Tome
Ssal saengsan, kagong chʻŏri mit pʻanmae ŭi sisŭtʻem-hwa e kwanhan yŏnʼguTong-gyu Pak · First published 1993Open the Tome