edited by Korean National Commission for UNESCO
Hollym, 2003
Buku Referensi
Soedel, Werner
Marcel Dekker, 1993
Buku Teks
Levi, Werner
The University of Minnesota Press, 1953
Buku Teks
Levi, Werner
University of Minnesota Press, 1954
Buku Teks
Clark Unioversity Press, 1955
Buku Teks