United Nations Educational, Scientific and Cultural Organization (UNESCO)
UNESCO, 1984
Buku Teks
Korea : The Korean Research Center
Majalah, Jurnal, Buletin
Haarman, Louann, author
Oxford University Press, 1989
Buku Teks
S. C. Brown, editor
Harvester Press, 1979
Buku Teks
Weber, Max, 1864-1920, author
Transaction Publishers, 2011
Buku Teks