Yonhap News Agency, 1994
Buku Referensi
edited by Kim Young-kwon, Lee So-jung
Korean Overseas Information Service, Ministry of Culture and Information, 1990
Buku Referensi
Korean Overseas Information Service, 1993
Buku Referensi
Hapdong News Agency , 1974
Buku Teks
Hapdong News Agency, 1971
Buku Teks