Arntz, Helmut, author
Press and Information Office of the Federal German, 1962
Buku Teks
Berlin : Media Consulta, 1993
Buku Teks
Media Consulta, 2003
Buku Referensi
Arntz, Helmut, author
Media Consulta, 1962
Buku Teks
Soul Korean Quersen Information Service 1989,
Buku Teks