Congratulatory speech to commerate south-north Korea joint declaration
 Artikel Jurnal
South-North dialogue in Korea
International Cultural Society of Korea, 1983
 Buku Teks
South-North dialogue in Korea
International Cultural Society of Korea , 1988
 Buku Teks
Ko, Un, 1933-, author
Abiding Places : Korea South & North
South Korea, 2006
 Buku Teks
A Comparative study of south and North Korea
National Unification Board, 1988
 Buku Teks
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