Buku Teks
Weismantel, Guy E.
Buku Teks
Holman, C. Hugh, author
Macmillan, 1986
Buku Referensi
edited by Kim Young-kwon, Lee So-jung
Korean Overseas Information Service, Ministry of Culture and Information, 1990
Buku Referensi
editors of Ebony
Johnson Publishing Company, , 1966
Buku Referensi