1. United Nations General Assembly,1989
2. A New History of Korea;Lee,1984
3. A Korean merchant, Chang Po-Go who was known as ‘Commissioner’ of trade of Korea, built a commercial empire with his main base at Chonghaejin (an island off the south coast, now known as Wando), and also established a trading communities in the southern coast of the Shantung Peninsula in China.
4. A New History of Korea;Lee,1984
5. Based on personal observation and analysis of specimens gathered from the seas around Huskan Island off the southwest Cholla coast, this work records the name, distribution, morphology, habits, and uses of 155 varieties of marine life.