KKugyŏk Sŏngho chilsŏKugyŏk Sŏngho chilsŏde Ik YiMateriasKorean PhilosophyEdiciones (1)Kugyŏk Sŏngho chilsŏ (1998)Hallim Taehakkyo Tʻaedong Kojŏn Yŏnʼguso · korMás obras de Ik YiNNa nŭn modŭn kŏt ŭl algo siptaNa nŭn modŭn kŏt ŭl algo siptaSachil sinpyonSongho Sonsaeng yokkyong chilso