Korea Annual 1971
Hapdong News Agency, 1971
 Buku Teks SO
Korea the best kept secret in Asia Korea National Tourism Corporation
Korea National Tourism Corporation, 1986
 Buku Teks SO
Jon, Sang-un
Historica Han'guksa vol. 2,3 = Korea Science History
Ikkullio, 2009
 Buku Referensi
Shin, Hyong Sik
A brief history of Korea
Ewha Womans University Press, 2005
 Buku Teks
Ha, Tae Hung
Korea-forty three centuries
Yonsei University Press, 1962
 Buku Teks SO