Choe, Chun-sik
Hanul Academy, 2011
Buku Teks
UNESCO, 1953
Buku Teks
D.S. Lewis, editor
Proquest, 2009
Buku Teks
by Albert P. Blaustein, Jay Sigler, Benjamin R. Beede, with Wayne E. Olson
Oceana Publications, 1977
Buku Referensi
International forums of Sao Paulo and Geneva , 1956
Buku Teks