21-segi kyŏngje, kisul ŭi pyŏnhyŏk
By: Yu Im-su chiŭm.
Edition: Chʻopʻan
Series: Chŏnhwanʼgi ŭi kyŏngje sipʻyŏng
Publisher: Pʻyŏngminsa
Published: 1992
Place of publication: Sŏul
Language: kor
Number of pages: 393
Other titles: Isibil segi kyŏngje, kisul ŭi pyŏnhyŏk