20-segi ŭi kyoyang myŏngjŏ
By: Sin Il-chʻŏl, Kim Yong-jun kongjŏ.
Series: Taehak saenghwal chŏnsŏ ; 9
Publisher: Sisa Yŏngŏsa
Published: 1981
Place of publication: Sŏul Tʻŭkpyŏlsi
Language: kor
Number of pages: 257